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After a fresh Ubuntu install I'm running into this error:
Sub-process /usr/bin/dpkg returned an error code (1)

Full log:

dpkg: error processing package shim-signed (--configure):
 installed shim-signed package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:
 shim-signed
E: Sub-process /usr/bin/dpkg returned an error code (1)

As I can see, this package is to blame: shim-signed.
But it is also a system package so I can't purge it, there is no cached installation file and sudo apt-get install --fix-broken results in the same log as previously.

Can someone please explain what this /usr/lib/grub/grub-multi-install is and how to fix it?

P.S. Running an ~2017 HP office laptop that still has BIOS for some odd reason. Might be related to grub somehow.

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  • The file /usr/lib/grub/grub-multi-install is part of the package grub-common, this package should be installed on your system. I'd try to reinstall the package (sudo apt reinstall grub-common) to see if this helps. Which version of Ubuntu did you install?
    – mook765
    Commented Aug 6, 2023 at 21:54
  • @mook765 Same result. It even detects that one package has to be fixed: 1 not fully installed or removed.
    – Lev Slinsen
    Commented Aug 7, 2023 at 14:31
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    It's a strange thing, no idea how to fix this. Since this is a fresh install I'd try a reinstall. Your machine should be EFI compatible if it's from ~2017. If there is no need for bios boot, I'd disable it in Bios settings, EFI boot is usually preferable.
    – mook765
    Commented Aug 7, 2023 at 15:04

1 Answer 1

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According to this bug report: https://bugs.launchpad.net/ubuntu/+source/shim-signed/+bug/2012196
...it can be fixed with sudo apt -f install grub-common/jammy grub2-common/jammy. Looks like it solved the issue for me.
After it is done, you can clean up unnecessary packages with sudo apt autoremove.

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  • In my case for kubectx I added a dependency on http://ftp.de.debian.org/debian even though I run ubuntu, which caused grub-common/now 2.06-3~deb10u1 to be installed. That is also what is mentioned in the linked bug report. I removed that dependency form my /etc/apt/sources.list and did the fix-install command you provided, fixing the issue.
    – Basti
    Commented Sep 19, 2023 at 8:44

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