The root cause of the error is
Sep 11 20:11:55 ubuntu ubiquity: Traceback (most recent call last):
Sep 11 20:11:55 ubuntu ubiquity: File "/usr/bin/apt-clone", line 113, in
<module>
Sep 11 20:11:55 ubuntu ubiquity: args.source, args.destination,
args.new_distro_codename, protect_installed)
Sep 11 20:11:55 ubuntu ubiquity: File
"/usr/lib/python2.7/dist-packages/apt_clone.py", line 305, in restore_state
Sep 11 20:11:55 ubuntu ubiquity: self._restore_package_selection(statefile,
targetdir, protect_installed)
Sep 11 20:11:55 ubuntu ubiquity: File
"/usr/lib/python2.7/dist-packages/apt_clone.py", line 426, in
_restore_package_selection
Sep 11 20:11:55 ubuntu ubiquity:
self._restore_package_selection_in_cache(statefile, cache, protect_installed)
Sep 11 20:11:55 ubuntu ubiquity: File
"/usr/lib/python2.7/dist-packages/apt_clone.py", line 406, in
_restore_package_selection_in_cache
Sep 11 20:11:55 ubuntu ubiquity: resolver.resolve()
Sep 11 20:11:55 ubuntu ubiquity: SystemError: E:Unable to correct problems, you
have held broken packages.
Which is caused by
Sep 11 20:05:31 ubuntu ubiquity: WARNING:root:can't add at-spi (pkg at-spi not
marked upgrade)
(bug 836798?)
This situation should handled more nicely than a python traceback
** Changed in: ubiquity (Ubuntu)
Status: New => Triaged
** Summary changed:
- Installation's upgrade feature crashed
+ ubiquity crashes with File "/usr/lib/python2.7/dist-packages/apt_clone.py",
line 406, in _restore_package_selection_in_cache when a package failed to
upgrade
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https://bugs.launchpad.net/bugs/847475
Title:
ubiquity crashes with File "/usr/lib/python2.7/dist-
packages/apt_clone.py", line 406, in
_restore_package_selection_in_cache when a package failed to upgrade
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