Failed to upgrade from Oneric to Precise: Could not early remove python-minimal

[Andrew Stewart]

Trying to upgrade from Oneric to Precise Beta 2 using "update-manager -d" will not complete. Calculating changes and downloading packages works fine, but once the upgrade gets to the install phase it aborts with this error "Could not install the upgrades". Running update-manager again prompts me to do a partial upgrade, which fails with the exact same error. I am now stuck in limbo between the two releases. Looking at the terminal output the exact error seems to be "Could not early remove python-minimal". Here is all the output:

$sudo update-manager -d

(update-manager:2505): Gdk-CRITICAL **: gdk_window_get_pointer: assertion `GDK_IS_WINDOW (window)' failed

(update-manager:2505): Gdk-CRITICAL **: gdk_window_get_pointer: assertion `GDK_IS_WINDOW (window)' failed

(update-manager:2505): Gdk-CRITICAL **: gdk_window_get_pointer: assertion `GDK_IS_WINDOW (window)' failed

(update-manager:2505): Gdk-CRITICAL **: gdk_window_get_pointer: assertion `GDK_IS_WINDOW (window)' failed

(update-manager:2505): Gdk-CRITICAL **: gdk_window_get_pointer: assertion `GDK_IS_WINDOW (window)' failed

(update-manager:2505): Gdk-CRITICAL **: gdk_window_get_pointer: assertion `GDK_IS_WINDOW (window)' failed
start: Job is already running: apport
ERROR:root:SystemError from cache.commit(): installArchives() failed
ERROR:root:found exception: 'E:This installation run will require temporarily removing the essential package python-minimal due to a Conflicts/Pre-Depends loop. This is often bad, but if you really want to do it, activate the APT::Force-LoopBreak option., E:Internal Error, Could not early remove python-minimal'
ERROR:root:not handled expection:
Traceback (most recent call last):

  File "/usr/bin/update-manager", line 106, in <module>
    controler.doPartialUpgrade()

  File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeController.py", line 1694, in doPartialUpgrade
    if not self.doDistUpgrade():

  File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeController.py", line 1083, in doDistUpgrade
    self._view.getTerminal().call(cmd)

  File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeViewGtk3.py", line 360, in call
    None, # child_setup_data

  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 43, in function
    return info.invoke(*args, **kwargs)

GError: Failed to execute child process "dpkg" (No such file or directory)

Traceback (most recent call last):
  File "/usr/bin/update-manager", line 106, in <module>
    controler.doPartialUpgrade()
  File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeController.py", line 1694, in doPartialUpgrade
    if not self.doDistUpgrade():
  File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeController.py", line 1083, in doDistUpgrade
    self._view.getTerminal().call(cmd)
  File "/usr/lib/python2.7/dist-packages/DistUpgrade/DistUpgradeViewGtk3.py", line 360, in call
    None, # child_setup_data
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 43, in function
    return info.invoke(*args, **kwargs)
gi._glib.GError: Failed to execute child process "dpkg" (No such file or directory)
$

[Jean-Baptiste Lallement (jibel)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. Could you please add the log files from '/var/log/dist-upgrade/' to this bug report as separate attachments? Thanks in advance.

[Jan (janek-ziniewicz)]

I can also confirm exactly the same error. Is there any way to revert back to 11.10?

I am attaching /var/log/dist-upgrade/ files.