While waiting for a fix to this issue, I decided to put a *hold* on these packages so that they won't be upgraded.
To place a hold on these packages using apt: sudo apt-mark hold \ libegl1-mesa \ libgbm1 \ libgl1-mesa-dri \ libgl1-mesa-glx \ libglapi-mesa \ libgles2-mesa \ libosmesa6 \ libosmesa6 \ libwayland-egl1-mesa \ libxatracker2 \ mesa-vdpau-drivers To list the packages on hold: apt-mark showhold Later if/when a fix is available the hold can be removed with: sudo apt-mark unhold \ libegl1-mesa \ libgbm1 \ libgl1-mesa-dri \ libgl1-mesa-glx \ libglapi-mesa \ libgles2-mesa \ libosmesa6 \ libosmesa6 \ libwayland-egl1-mesa \ libxatracker2 \ mesa-vdpau-drivers -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1780664 Title: Recent libgl-mesa graphics update prevents drop down list menu appearing in apps like firefox three line/bar menu icon To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1780664/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs