Comment 0 for bug 1949116

It's not possible to install libgl1-mesa-dri from hirsute-updates on a system that does not have universe enabled because it depends on libllvm12 from universe. This was not the case with the version of libgl1-mesa-dri in the release pocket because it depended upon libllvm11.

(hirsute-amd64)root@impulse:~# apt-get install libgl1-mesa-dri
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:
 libgl1-mesa-dri : Depends: libllvm12 (>= 1:9~svn298832-1~) but it is not installable
E: Unable to correct problems, you have held broken packages.

(hirsute-amd64)root@impulse:~# apt-cache show libgl1-mesa-dri
Package: libgl1-mesa-dri
Architecture: amd64
Version: 21.0.3-0ubuntu0.3
Multi-Arch: same
Priority: optional
Section: libs
Source: mesa
Origin: Ubuntu
Maintainer: Ubuntu Developers <email address hidden>
Original-Maintainer: Debian X Strike Force <email address hidden>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 37016
Depends: libc6 (>= 2.33), libdrm-amdgpu1 (>= 2.4.100), libdrm-intel1 (>= 2.4.38), libdrm-nouveau2 (>= 2.4.66), libdrm-radeon1 (>= 2.4.31),
libdrm2 (>= 2.4.75), libelf1 (>= 0.142), libexpat1 (>= 2.0.1), libgcc-s1 (>= 3.4), libglapi-mesa (= 21.0.3-0ubuntu0.3), libllvm12 (>= 1:9~s
vn298832-1~), libsensors5 (>= 1:3.5.0), libstdc++6 (>= 5.2), libvulkan1 (>= 1.2.131.2), libzstd1 (>= 1.3.2), zlib1g (>= 1:1.1.4)
Filename: pool/main/m/mesa/libgl1-mesa-dri_21.0.3-0ubuntu0.3_amd64.deb

This is blocking some CPC builds:
https://launchpad.net/~cloud-images/+livefs/ubuntu/hirsute/cpc-development/+build/306039