[Bug 1928601] [NEW] Ubuntu fails to start by default after upgrade 18.04 to 20.04 in virtual machine

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When upgrading virtual machine from Ubuntu 18.04 to 20.04 it fails to
boot with kernel panic to run 5-series kernel, which is default in
20.04, but can run 4-series kernel, which comes with Ubuntu 18.04.
Tested with Microsoft's Hyper-V and Ubuntu's libvirt qemu. Results are
identical.

More information https://askubuntu.com/questions/1338236/ubuntu-fails-
to-start-by-default-after-upgrade-18-04-to-20-04/1338722#1338722

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


** Tags: bot-comment hyper-v libvirt qemu
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Ubuntu fails to start by default after upgrade 18.04 to 20.04 in virtual machine
https://bugs.launchpad.net/bugs/1928601
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