Comment 3 for bug 1975388

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Bijo Alex Thomas (bijoalex) wrote : Re: upgrade from 18.04 to 20.04 while on rollbacked kernel 4.15-0-177 - package grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2 failed to install/upgrade: installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1

Agree with the comment and this particular update process is likely acting as expected since an unsigned kernel was found. However, just to set the context right - I didn't install the unsigned kernel. I rolled back kernel 4.15-0-177 to work around Bug #1973482, using apt remove and it automatically installed the unsigned version instead.