Ubuntu 21.04 here.
Also getting this, as well.
Setting up shim-signed (1.47+15.4-0ubuntu2) ...
dpkg: error processing package shim-signed (--configure):
installed shim-signed package post-installation script subprocess returned
error exit status 10
grub-efi-amd64-signed is installed already.
I'm getting this on a fresh Ubuntu 20.04 install.
"apt install grub-efi-amd64" does not fix it.
# apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not
I confirm that
sudo apt install grub-efi-amd64
fix it.
Lubor
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Title:
installed grub-efi-amd64-signed package post-installation script
I can confirm that installing grub-efi-amd64 as Justin mentioned, did
the trick for me as well.
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Title:
installed grub-efi-amd64-signed package
I had the same problem. This was fixed for me by installing grub-efi-
amd64
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Title:
installed grub-efi-amd64-signed package post-installation
Same problem here after upgrading from 19.10
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Title:
installed grub-efi-amd64-signed package post-installation script
subprocess returned
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: grub2-signed (Ubuntu)
Status: New => Confirmed
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