This is a known issue, libglvnd Breaks/Replaces on mesa need to be bumped due to dev headers that moved to libglvnd from mesa
that said, you had mesa from bionic-proposed before the upgrade, and that's not supported
This is a known issue, libglvnd Breaks/Replaces on mesa need to be bumped due to dev headers that moved to libglvnd from mesa
that said, you had mesa from bionic-proposed before the upgrade, and that's not supported