[Bug 1930077] Re: installed shim-signed package post-installation script subprocess returned error exit status 1

[Sai Vinoba]

This also affects UM 21.04. Possibly others.

Also, this happens with both Secure Boot on as well off. I read bugs
#1928434 and #1925010 but they were upgrades and fresh installation
worked. In my case installation itself is failing.

On UM though, even after installed showed failed message, I went ahead
and choose the new entry from Grub menu (of another install) but the
screen stays on UM logo. Using text mode shows some sort of kernel panic
or unable to mount message which I could not capture.

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Title:
  installed shim-signed package post-installation script subprocess
  returned error exit status 1

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