Comment 1 for bug 1879948

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Steve Langasek (vorlon) wrote : Re: shim-signed installation focal fossa

> installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 10

This error status indicates there is a problem with debconf communication from within this package.

grub-efi-amd64-signed does not invoke debconf itself, but does so via /usr/lib/grub/grub-multi-install.

Can you run 'sudo /usr/lib/grub/grub-multi-install --target=x86_64-efi' manually and see if this command completes successfully?

If it does not, please run 'sudo env DEBCONF_DEBUG=developer /usr/lib/grub/grub-multi-install --target=x86_64-efi' and paste the output.