[Bug 1653784] Re: do-release-upgrade failure on Xencenter

[Brian Murray]

Thanks for taking the time to report this bug and helping to make Ubuntu
better. Could you please add the log files from '/var/log/dist-upgrade/'
to this bug report as separate attachments? Thanks in advance.

** Package changed: ubuntu => ubuntu-release-upgrader (Ubuntu)

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

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https://bugs.launchpad.net/bugs/1653784

Title:
  do-release-upgrade failure on Xencenter

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

Bug description:
  I tried to use do-release-upgrade to go from 14.04 to 16.04; instead
  the upgrade crashed, I was left with a somewhat functional box that
  thought it was on 16.04, yet still suggested I upgrade to 16.04.

  Possibly relevant factors

  - The system being upgraded was a virtual machine, running on Xen (the extra-cost Citrix version).In particular it announces itself as "Citrix XenServer Host 7.0.0-125380c" 
  - When do-release-upgrade suggested that upgrading over ssh was a bad idea, I chose to run do-release-upgrade from the Xencenter console
  - The system had docker installed, from a non-ubuntu apt repository. 

  Behaviour seen:

  - the upgrade got a long way - perhaps 2 hours before I went home
  - the mess I found on the console in the morning suggested the upgrade had been asking me for input, but screen had malfunctioned in some way, putting me in a shell window with no answer expected. 

  I'm afraid I didn't have the sense to take a screenshot of the console
  (which has no scrollback), and I deleted the VM to make space to
  install 16.04 from scratch, before deciding I really ought to file a
  bug, so I have very few details for you.

  However, if I'm right that the cause is basic incompatibility between
  some aspect of Xen (probably the Xencenter console) and do-release-
  upgrade, it should be trivially replicable.

  Also worth knowing - naive attempts to install either 14.04 or 16.04
  on this version of Xen don't work, thanks to some Citrix issue(s). See
  https://unyield.com/server-management/installing-ubuntu-14-04-on-
  xenserver-6-5-via-url-install-guide/ or
  http://virantha.com/2014/05/21/ubuntu-14-04-trusty-on-xenserver-62/
  for the work-around required.

  And finally, I believe that the Xencenter "console" device is a poor
  emulation of normal console behaviour. I would be totally unsurprised
  if the root cause of my failure is an attempt to use a tty feature
  that doesn't quite work right on xen.

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