This appears to affect the Mate flavor, but not the main Ubuntu (Gnome
flavor). I installed a fresh VM using ubuntu-18.04.1-desktop-amd64.iso
and do-release-upgrade worked fine.
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Public bug reported:
I'm just trying to upgrade from to 20.04. It is the guest OS in vmware
workstaion running on win7-64. I also tried installing a FRESH Ubuntu
Mate 18.04 as the guest in VirtualBox running on Mate 20.04 and the same
error happened when I ran do-release-upgrade.
root@VM:~#
My perspective suggests that this bug might have came from upsteam.
I'm running DEBIAN 9 in VMware Workstation 12.5.9 build-7535481 and
having this exact same issue.
AFFECTED = Linux 4.9.0-8-686-pae #1 SMP Debian 4.9.110-3+deb9u4
(2018-08-21) i686 GNU/Linux
NOT affected = Linux 4.9.0-7-686-pae
