My problem is similar
fresh install on fujitsu lifebook t902
Iam able to use Grub on startup after on Win7 in admin-terminal : bcdedit /set
"{bootmgr}" path \EFI\ubuntu\grub64.efi
After every programinstallation there is an error message : "E:
grub-efi-amd64-signed: installed grub-efi-amd64-signed package
post-installation script subprocess returned error exit status 1
E: shim-signed: προβλήματα εξάρτησης - αφήνεται μη ρυθμισμένο"
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https://bugs.launchpad.net/bugs/1795807
Title:
package grub-efi-amd64-signed 1.93.7+2.02-2ubuntu8.6 failed to
install/upgrade: installed grub-efi-amd64-signed package post-
installation script subprocess returned error exit status 1
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https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1795807/+subscriptions
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