[Bug 2065534] Re: shim-signed depends unsatisfiable when installing grub-xen on ubuntu 24.04

[Son Luong]

I am also having trouble with this exact error when trying to remove python 3.11. 
I am on 23.10 and trying to upgrade to 24.04.

```
~> sudo apt remove python3.11
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 shim-signed : Depends: grub-efi-amd64-signed (>= 1.191~) but it is not going to be installed or
                        grub-efi-arm64-signed (>= 1.191~) but it is not installable or
                        base-files (< 12.3)
               Depends: grub-efi-amd64-signed (>= 1.187.2~) but it is not going to be installed or
                        grub-efi-arm64-signed (>= 1.187.2~) but it is not installable
               Depends: grub2-common (>= 2.04-1ubuntu24) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
exit 100
```

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https://bugs.launchpad.net/bugs/2065534

Title:
  shim-signed depends unsatisfiable when installing grub-xen on ubuntu
  24.04

Status in shim-signed package in Ubuntu:
  Invalid

Bug description:
  Hi,

  wanted to install xen on a freshly setup 24.04 server:


  apt-get install grub-xen

  Reading package lists...
  Building dependency tree...
  Reading state information...
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:

  The following packages have unmet dependencies:
   shim-signed : Depends: grub-efi-amd64-signed (>= 1.191~) but it is not going to be installed or
                          grub-efi-arm64-signed (>= 1.191~) but it is not installable or
                          base-files (< 12.3) but 13ubuntu10 is to be installed
                 Depends: grub-efi-amd64-signed (>= 1.187.2~) but it is not going to be installed or
                          grub-efi-arm64-signed (>= 1.187.2~) but it is not installable
  E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

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