[Bug 1748509] Re: do-partial-upgrade crashed with SIGSEGV under wayland

[Balint Reczey]

** Also affects: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1748509

Title:
   do-partial-upgrade crashed with SIGSEGV under wayland

Status in ubuntu-release-upgrader package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  New

Bug description:
  [Impact]

  Users can't upgrade to next Ubuntu release running the upgrade GUI under Wayland if a full upgrade fails and update-manager fails back to a partial upgrade.
  The backport is needed to let Artful users to upgrade to Bionic without applying workarounds manually.

  [Test Case]

  1. Install 17.10 and all the updates available
  2. TODO: Make changes to make the full upgrade fail and as a result update-manager fall back to partial upgrade.
  3. Start a wayland session (Ubuntu in GDM)
  4. Check that root is not listed in xhost output:
    $ xhost
    access control enabled, only authorized clients can connect
    SI:localuser:rbalint
  5. If root is present, remove it:
    $ xhost -si:localuser:root
    localuser:root being removed from access control list
    $ xhost
    access control enabled, only authorized clients can connect
    SI:localuser:rbalint
  6. open a terminal and run the following command:
    $ update-manager -cd
  7. When you're prompted to upgrade to 18.04, accept and proceed.
    Expected result on fixed version: Upgrade starts.
    Result on unfixed version: The GUI crashes.

  [Test Case (for regressions)]

  Repeat the test cases running under X.org (Ubuntu on Xorg in GDM) and check that:
  a. Upgrade still works
  b. xhost output is not modified

  [Regression Potential]

  The upgrade GUI may crash in a different way when applying the workaround fails.
  Do-partial-upgrade may fail to detect development or versions to upgrade to.
  The workaround "xhost +si:localuser:root" may be added under Xorg as well

  [Other Info]
  This bug covers performing a a partial upgrade which case is not covered int the fix for LP: #1732185 .

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