[Bug 1544904] Re: Updating 15.10 to 16.04 alpha2 failed: subprocess exit status 127

[Brian Murray]

Please run apport-collect 1544904 in a terminal so the necessary log
files will be gathered.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1544904

Title:
  Updating 15.10 to 16.04 alpha2 failed: subprocess exit status 127

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

Bug description:
  Hi,

  just some testing feedback:

  I yesterday tried to update a Xubuntu 15.10 64bit (latest update
  status) to 16.04 alpha2 with update-manager -d, which went wrong and
  aborted (not a  problem, was just a virtual testing machine and I made
  a snapshot before upgrading, can jump back to the state before
  updating with a mouse click).

  Within the upgrade process, several packages failed and complained
  like

    got an error from dpkg for pkg: 'install-info': 'subprocess
  installed post-installation script returned an error exit status 127'

  
  Lots of these messages, also for gconf2, util-linux, initscripts, sgml-base, systemd, systemd-sysv, e2fsprogs, hostname,...

  
  Unfortunately, no further details, not even in the upgrade logs, just lots of messages like this, just with different package names.  

  
  These problems (seems to be the same problem for all) caused an avalanche of uninstallable packages due to dependencies, and finally caused update-manager to abort half-way. Especially systemd could not be properly installed. Now  I have a (more or less) running system somewhere in the middle between 15.10 and 16.04.  (I mean: Wow. Which OS would still boot and work in important aspect when stuck in the middle of an upgrade?) 

  However: As far as I can see there is a single problem causing this
  exit status 127, common in many post-installation scripts, which makes
  the upgrade process crash completely.

  regards

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