Cannot uninstall keystone

[Vincent Ladeuil]

While trying to uninstall keystone (to start from a clean slate), synaptic complains:

(Reading database ... 304179 files and directories currently installed.)
Removing keystone ...
dpkg: error processing keystone (--remove):
 subprocess installed pre-removal script returned error exit status 10
No apport report written because MaxReports is reached already
                                                              postinst called with unknown argument `abort-remove'
Errors were encountered while processing:
 keystone
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:

Trying to force a re-installation instead, it still fails with:

Setting up keystone (2012.1~rc1~20120316.2145-0ubuntu1) ...
Traceback (most recent call last):
  File "/usr/bin/keystone-manage", line 28, in <module>
    cli.main(argv=sys.argv, config_files=config_files)
  File "/usr/lib/python2.7/dist-packages/keystone/cli.py", line 148, in main
    return run(cmd, (args[:1] + args[2:]))
  File "/usr/lib/python2.7/dist-packages/keystone/cli.py", line 134, in run
    return CMDS[cmd](argv=args).run()
  File "/usr/lib/python2.7/dist-packages/keystone/cli.py", line 36, in run
    return self.main()
  File "/usr/lib/python2.7/dist-packages/keystone/cli.py", line 55, in main
    driver = utils.import_object(getattr(CONF, k).driver)
  File "/usr/lib/python2.7/dist-packages/keystone/common/utils.py", line 58, in import_object
    __import__(import_str)
TypeError: __import__() argument 1 must be string, not None
dpkg: error processing keystone (--configure):
 subprocess installed post-installation script returned error exit status 1
No apport report written because MaxReports is reached already
                                                              Errors were encountered while processing:
 keystone
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover:

[Soren Hansen (soren)]

Hm, yeah, calling keystone-manage in postrm... That's probably not going to work (hint: *post* removal scripts shouldn't be referencing things in the package)

[Vincent Ladeuil (vila)]

Forget the re-install part, I renamed /etc/keystone while hammering, restoring its proper name allow the re-installation to complete.

Removing the package is still not possible

[Vincent Ladeuil (vila)]

@Soren: Sorry for the confusing bug report, keystone-manage is called while re-installing, not while removing.