WORKAROUND:
From:
https://askubuntu.com/questions/1031066/errors-during-upgrade-
from-17-10-to-18-04-shim-signed-and-grub-efi-amd64-signed
sudo su -
cd /boot/efi/EFI
mv ubuntu ubuntu-old
apt install -f
mv ubuntu-old ubuntu
update-grub2
exit
"It seems that the newer grub couldn't access the /boot/efi/EFI/ubuntu
directory, for some reason. So since my system was booting normally, I want
just to get rid off that error everytime I was using the apt. So I thought that
workaround just to check it the installation would finish and it seems that
worked. Lastly, I restored the ubuntu directory name just not mess around with
my system's ability to boot. It seems, I forgot to mention to issue an
update-grub2 afterwards. – George Tavantzopoulos"
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1753518
Title:
package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
install/upgrade: installed grub-efi-amd64-signed package post-
installation script subprocess returned error exit status 1
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1753518/+subscriptions
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