[Bug 1769433] Re: do-release-upgrade from 32-bit 16.04 to 18.04 goes ahead, doesn't work and messes everything up

[Brian Murray]

While support for the i386 installer image was removed, the 32 packages
still exist in the archive so an upgrade from Ubuntu 16.04 to Ubuntu
18.04 should be fine. Just to be certain I tested this today and
everything worked out. Do you happen to have any more details about how
everything was messed up? Specifically log files of the upgrade would be
helpful.

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

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https://bugs.launchpad.net/bugs/1769433

Title:
  do-release-upgrade from 32-bit 16.04 to 18.04 goes ahead, doesn't work
  and messes everything up

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

Bug description:
  I decided to test Ubuntu 18.04 on an old computer with 16.04 32-bit
  without knowing that only 64-bit was supported. do-release-upgrade
  seemed to perform all the actions without any problem. But, logically,
  the newly installed OS didn’t work.

  After a quick research, I realised that the problem was the 32-/64-bit
  part and reinstalled the 16.04 32-bit version. I was forced to format
  the main partition as far as the 32-bit installer didn't recognise the
  64-bit installation as a valid OS.

  After finishing the 16.04 32-bit installation, performing the
  recommended updates and installing just a few programs (very stable
  and which I have always used on that computer), the OS started
  behaving weirdly. At first sight, it was working fine, but kept
  getting regularly frozen and not starting properly. Finally, I have
  been able to fix all the problems by deleting the old partitions,
  creating them again and reinstalling Ubuntu 16.04 32-bit.

  Long story short: my computer has been behaving erratically for 2 days
  without never getting a clear indication about what might be wrong.
  Even worse, all this has been provoked because the OS  allowed me to
  perform an impossible action. The fix seems also quite
  straightforward: avoid any 32-bit version to be upgraded unless that
  format is available.

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