Error: grub-efi-amd64-signed in Ubuntu 20.04. Trying to install packages

Question

I'm having problems when Iḿ trying ¿to install any package or software. My OS is Ubuntu 20.04. I've already tried all the solutions mentioned in this post https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/1871963, including configure the UEFI, following the next comand lines:

   # sudo apt-get purge grub\*
   # sudo apt-get install grub-efi
   # sudo apt-get autoremove
   # sudo update-grub 

etc.

The error message appears even when the upgrades and is installed an app from the "Ubuntu Software" application...

Errors were encountered while processing:
grub-efi-amd64-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)

Thanks!

Answer 1

I had this same problem the last few days. Months ago I installed Ubuntu 20.04 alongside Win10 I had to switch the BIOS to AHCI from RAID as it wouldn't allow install. Then after install I could switch back to RAID to allow Win10 dual boot. However along some update it messed it up and I had to switch back to AHCI and reinstalled grub as above. It sorted the problem.