[Bug 994063] Re: do-release-upgrade can't be continued after drop to shell

[mforbes]

This still seems to be an issue 3 years later.  Can someone in the know
please update the status with this and/or suggest a direction to fix
this?

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https://bugs.launchpad.net/bugs/994063

Title:
  do-release-upgrade can't be continued after drop to shell

Status in update-manager-core package in Ubuntu:
  Confirmed

Bug description:
  I'm attempting to run an upgrade from 10.04 LTS to 12.04 LTS. I ran
  "do-release-upgrade -d" and after some time the process reported a
  conflict in a configuration file.

  Selecting "drop to shell to examine differences" gave me a shell
  alright, but there were some odd issues with the TTY - line breaks not
  performing a carriage return and so on. Then typing "exit" to exit
  that shell exited the entire install process (which is running in tmux
  or screen or similar).

  The end result is a half-installed system in an unknown state, with no
  obvious means of recovery, and I'm going to have to revert to backup.
  Consequently I can't give any useful information about version
  numbers, except all packages had been updated to the most recent in
  Lucid prior to upgrade.

  I would STRONGLY suggest you provide an option to run "do-release-
  upgrade" without tmux or whatever it is, and/or provide an additional
  argument to "do-release-upgrade" which will allow you to reconnect to
  an disconnected instance.


  
  Incidentally this was also reported by someone else here: http://ubuntuforums.org/showthread.php?t=1969849

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