Adding a Location in School/Resources causes an error and blank screen

[caveman]

After upgrading from Schooltool 2.6 to 2.8 I wanted to add a new location for one of the courses.

I went to the School tab, clicked on Resources then on the link "Add Location" and got a white page with the following writing:

No data received
ERR_EMPTY_RESPONSE
Unable to load the webpage because the server sent no data.

In the error.log file I found the following:

*********************************************************
2016-01-14 14:20:43,250 http://192.168.20.90:7080/resources/addLocation.html
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 135, in publish
    response.setResult(result)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,342 Exception while rendering view on exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,344 http://192.168.20.90:7080/resources/addLocation.html
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,349 Exception during task
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/server/taskthreads.py", line 49, in handlerThread
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/serverchannelbase.py", line 205, in service
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/http/httptask.py", line 67, in service
    self.channel.server.executeRequest(self)
  File "/usr/lib/python2.7/dist-packages/zope/server/http/wsgihttpserver.py", line 109, in executeRequest
    result = self.application(env, curriedStartResponse(task))
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 206, in __call__
    return app(environ, start_response)
  File "/usr/lib/python2.7/dist-packages/zope/app/wsgi/__init__.py", line 59, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 142, in publish
    obj, request, exc_info, True)
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 411, in handleException
    response.handleException(exc_info)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 850, in handleException
    self.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,456 http://192.168.20.90:7080/resources/addLocation.html
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 135, in publish
    response.setResult(result)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,547 Exception while rendering view on exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,550 http://192.168.20.90:7080/resources/addLocation.html
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,555 Exception during task
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/server/taskthreads.py", line 49, in handlerThread
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/serverchannelbase.py", line 205, in service
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/http/httptask.py", line 67, in service
    self.channel.server.executeRequest(self)
  File "/usr/lib/python2.7/dist-packages/zope/server/http/wsgihttpserver.py", line 109, in executeRequest
    result = self.application(env, curriedStartResponse(task))
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 206, in __call__
    return app(environ, start_response)
  File "/usr/lib/python2.7/dist-packages/zope/app/wsgi/__init__.py", line 59, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 142, in publish
    obj, request, exc_info, True)
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 411, in handleException
    response.handleException(exc_info)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 850, in handleException
    self.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,662 http://192.168.20.90:7080/resources/addLocation.html
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 135, in publish
    response.setResult(result)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,753 Exception while rendering view on exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,756 http://192.168.20.90:7080/resources/addLocation.html
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,762 Exception during task
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/server/taskthreads.py", line 49, in handlerThread
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/serverchannelbase.py", line 205, in service
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/http/httptask.py", line 67, in service
    self.channel.server.executeRequest(self)
  File "/usr/lib/python2.7/dist-packages/zope/server/http/wsgihttpserver.py", line 109, in executeRequest
    result = self.application(env, curriedStartResponse(task))
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 206, in __call__
    return app(environ, start_response)
  File "/usr/lib/python2.7/dist-packages/zope/app/wsgi/__init__.py", line 59, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 142, in publish
    obj, request, exc_info, True)
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 411, in handleException
    response.handleException(exc_info)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 850, in handleException
    self.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,959 Exception while rendering view on exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:43,966 Exception during task
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/server/taskthreads.py", line 49, in handlerThread
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/serverchannelbase.py", line 205, in service
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/http/httptask.py", line 67, in service
    self.channel.server.executeRequest(self)
  File "/usr/lib/python2.7/dist-packages/zope/server/http/wsgihttpserver.py", line 109, in executeRequest
    result = self.application(env, curriedStartResponse(task))
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 206, in __call__
    return app(environ, start_response)
  File "/usr/lib/python2.7/dist-packages/zope/app/wsgi/__init__.py", line 59, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 142, in publish
    obj, request, exc_info, True)
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 411, in handleException
    response.handleException(exc_info)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 850, in handleException
    self.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:44,290 Exception while rendering view on exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:44,298 Exception during task
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/server/taskthreads.py", line 49, in handlerThread
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/serverchannelbase.py", line 205, in service
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/http/httptask.py", line 67, in service
    self.channel.server.executeRequest(self)
  File "/usr/lib/python2.7/dist-packages/zope/server/http/wsgihttpserver.py", line 109, in executeRequest
    result = self.application(env, curriedStartResponse(task))
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 206, in __call__
    return app(environ, start_response)
  File "/usr/lib/python2.7/dist-packages/zope/app/wsgi/__init__.py", line 59, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 142, in publish
    obj, request, exc_info, True)
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 411, in handleException
    response.handleException(exc_info)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 850, in handleException
    self.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:49,500 Exception while rendering view on exception
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 380, in handleException
    response.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'
2016-01-14 14:20:49,507 Exception during task
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/zope/server/taskthreads.py", line 49, in handlerThread
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/serverchannelbase.py", line 205, in service
    task.service()
  File "/usr/lib/python2.7/dist-packages/zope/server/http/httptask.py", line 67, in service
    self.channel.server.executeRequest(self)
  File "/usr/lib/python2.7/dist-packages/zope/server/http/wsgihttpserver.py", line 109, in executeRequest
    result = self.application(env, curriedStartResponse(task))
  File "/usr/lib/python2.7/dist-packages/paste/urlmap.py", line 206, in __call__
    return app(environ, start_response)
  File "/usr/lib/python2.7/dist-packages/zope/app/wsgi/__init__.py", line 59, in __call__
    request = publish(request, handle_errors=handle_errors)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/publish.py", line 142, in publish
    obj, request, exc_info, True)
  File "/usr/lib/python2.7/dist-packages/zope/app/publication/zopepublication.py", line 411, in handleException
    response.handleException(exc_info)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 850, in handleException
    self.setResult(body)
  File "/usr/lib/python2.7/dist-packages/zope/publisher/http.py", line 776, in setResult
    r, headers = self._implicitResult(r)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 114, in _implicitResult
    html = self._generateIncludes(resource_libraries)
  File "/usr/lib/python2.7/dist-packages/zc/resourcelibrary/publication.py", line 158, in _generateIncludes
    url = library_resources[file_name]()
  File "/usr/lib/python2.7/dist-packages/zope/browserresource/directory.py", line 70, in __getitem__
    raise KeyError(name)
KeyError: u'3.6.1/ckeditor/ckeditor.js'

*********************************************************

Any ideas how I can fix this so that I can add a Location?

THanks.

[Gediminas Paulauskas (menesis)]

It is strange that 2.6 worked. Maybe you upgraded Ubuntu, too?

Try restarting schooltool

  $ sudo service schooltool stop
  $ sudo service schooltool start

See https://answers.launchpad.net/schooltool/+question/254111

The bug is https://bugs.launchpad.net/ubuntu/+source/zope.html/+bug/1306986 but that has been fixed long ago.

[caveman (caveman-poid)]

Hi Gediminas,

I tried stopping and restarting as you suggested but it is still not working properly. I glanced at the solution you suggested but would prefer not to do a total reinstall if necessary...

Any other suggestions?

Thanks,

[Tom Hoffman (tom-hoffman)]

This is a ckeditor related issue, right?

[Gediminas Paulauskas (menesis)]

No, reinstall is not what I suggest, that's what a user did and it somehow helped.

You can try reinstalling only the problematic package

$ sudo apt-get install --reinstall python-zope.html

and start/stop schooltool.

What versions of the packages do you have: python-schooltool, python-schooltool.gradebook, python-zope.html? You can do this with a command, that also lets determine where that package came from.

$ apt-cache policy python-zope.html
python-zope.html:
  Installed: 2.2.0-0ubuntu11
  Candidate: 2.2.0-0ubuntu11
  Version table:
 *** 2.2.0-0ubuntu11 0
        500 http://lt.archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
        100 /var/lib/dpkg/status

I suspect from Bug #1533147 you reported earlier, the problem is that you have a local copy of an old version somewhere, and it gets picked up first.

Does this output anything?

$ grep ckeditor /etc/schooltool/standard/plugins

[caveman (caveman-poid)]

Hi Gediminas,

Here is what I got with the version checks:

$ apt-cache policy python-schooltool
python-schooltool:
  Installed: 1:2.8.4-0ubuntu1
  Candidate: 1:2.8.4-0ubuntu1
  Version table:
 *** 1:2.8.4-0ubuntu1 0
        500 http://ppa.launchpad.net/schooltool-owners/2.8/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status
     1:2.6.3-0ubuntu2 0
        500 http://mirror.amsiohosting.net/archive.ubuntu.com/ trusty-updates/universe i386 Packages
     1:2.6.3-0ubuntu1 0
        500 http://mirror.amsiohosting.net/archive.ubuntu.com/ trusty/universe i386 Packages

$ apt-cache policy python-schooltool.gradebook
python-schooltool.gradebook:
  Installed: 2.8.4.1-0ubuntu1
  Candidate: 2.8.4.1-0ubuntu1
  Version table:
 *** 2.8.4.1-0ubuntu1 0
        500 http://ppa.launchpad.net/schooltool-owners/2.8/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status
     2.6.3-0ubuntu1 0
        500 http://mirror.amsiohosting.net/archive.ubuntu.com/ trusty/universe i386 Packages

$ apt-cache policy python-zope.html
python-zope.html:
  Installed: 2.4.2-0ubuntu1
  Candidate: 2.4.2-0ubuntu1
  Version table:
 *** 2.4.2-0ubuntu1 0
        500 http://ppa.launchpad.net/schooltool-owners/2.8/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status
     2.2.0-0ubuntu11 0
        500 http://mirror.amsiohosting.net/archive.ubuntu.com/ trusty/universe i386 Packages

Then with the grep output I got:

$ grep ckeditor /etc/schooltool/standard/plugins
grep: /etc/schooltool/standard/plugins: Is a directory

Since it looked like the python-zope.html package was (as you mentioned) an old version I did the following:

$ sudo apt-get install --reinstall python-zope.html

and start/stop schooltool.

Then I checked the package again:

$ apt-cache policy python-zope.html
python-zope.html:
  Installed: 2.4.2-0ubuntu1
  Candidate: 2.4.2-0ubuntu1
  Version table:
 *** 2.4.2-0ubuntu1 0
        500 http://ppa.launchpad.net/schooltool-owners/2.8/ubuntu/ trusty/main i386 Packages
        100 /var/lib/dpkg/status
     2.2.0-0ubuntu11 0
        500 http://mirror.amsiohosting.net/archive.ubuntu.com/ trusty/universe i386 Packages

It looks like nothing changed but everything now works fine...

Thanks for your help!