sudo apt-get purge grub-pc grub-pc-bin grub-gfxpayload-lists grub-efi-amd64-signed+
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'grub-gfxpayload-lists' is not installed, so not removed
Package 'grub-pc' is not installed, so not removed
Package 'grub-pc-bin' is not installed, so not removed
grub-efi-amd64-signed is already the newest version (1.93.14+2.02-2ubuntu8.13).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.