[Bug 1511637] Re: Can't upgrade to Wily Werewolf

[Douglas P Finch]

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 at 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

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  do-release-upgrade fails with the following error:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.3
  ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Fri Oct 30 12:49:48 2015
  InstallationDate: Installed on 2014-04-23 (554 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-30 (0 days ago)

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