[Bug 1809920] Re: prompt to upgrade to 18.04 shows while upgrade to 16.04 is still in progress

[Brian Murray]

I went ahead and tested this to see what would happen if I did click
'yes' on the upgrade prompt to Ubuntu 18.04. As the team suspected the
upgrade to 18.04 failed because it was unable to get an exclusive lock,
so while this is ugly it won't actually break anybody. Additionally, if
I recall correctly the release upgrade prompt is on a timer so if
somebody received a prompt to upgrade to the next release and clicked
'yes' they shouldn't receive a prompt to upgrade to the next next
release. Attached you find a screenshot of the ugly.

And for future reference to recreate this I manually ran check-new-
release-gtk a couple of times while the upgrade was in process (i.e.
after the downloading phase) until it finally worked.

** Attachment added: "double-upgrade.png"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1809920/+attachment/5250245/+files/double-upgrade.png

** Tags removed: rls-dd-incoming
** Tags added: rls-ee-incoming

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https://bugs.launchpad.net/bugs/1809920

Title:
  prompt to upgrade to 18.04 shows while upgrade to 16.04 is still in
  progress

Status in update-manager package in Ubuntu:
  Confirmed
Status in update-manager source package in Xenial:
  Confirmed

Bug description:
  While upgrading a desktop system from 14.04 to 16.04 over the
  holidays, I was prompted to upgrade to 18.04... while the upgrade to
  16.04 was still running.

  I don't know what would happen if I clicked 'yes', but I'm sure it
  wouldn't DTRT.

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