the same error happened on two servers (stupid me)
problem began with mediawiki (i should have removed it before the second
attempt)
from the console:
=================
Errors were encountered while processing:
mediawiki
Error in function:
SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 102, in
apport_excepthook
pr.add_proc_info(extraenv=['PYTHONPATH', 'PYTHONHOME'])
File "/usr/lib/python3/dist-packages/apport/report.py", line 539, in
add_proc_info
raise ValueError('%s does not exist' % self['ExecutablePath'])
ValueError: /usr/bin/python3.4 (deleted) does not exist
Original exception was:
SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Could not install the upgrades
The upgrade has aborted. Your system could be in an unusable state. A
recovery will run now (dpkg --configure -a).
Please report this bug in a browser at
http://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+filebug
and attach the files in /var/log/dist-upgrade/ to the bug report.
installArchives() failed
Setting up mediawiki (1:1.19.20+dfsg-2.3) ...
ln: failed to create symbolic link
‘/etc/apache2/conf-available/mediawiki.conf’: File exists
dpkg: error processing package mediawiki (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
mediawiki
Upgrade complete
The upgrade has completed but there were errors during the upgrade
process.
To continue please press [ENTER]
root@hyperon:/etc# dpkg --configure -a
=================
PS without libapt working there is no way to tell or force further upgrades
Is it possible to restart do-release-upgrade?
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https://bugs.launchpad.net/bugs/1511637
Title:
Can't upgrade to Wily Werewolf
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