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mesa 18.0.5 is currently in bionic-proposed.

https://www.ubuntuupdates.org/pm/mesa

Ubuntu recently backported MESA 18.0.5-0ubuntu0~16.04.1 into Xenial (on top of which Mint 18.x is based). The problem with this is that its version is superior to the one in Ubuntu Bionic (on top of which Mint 19 is based). This creates issues in the APT dependency resolver during the upgrade, resu...

Hi everyone,

We're just after finding out Ubuntu backported mesa into Xenial with a version number higher than the one in Bionic. They basically broke the upgrade path between 16.04 and 18.04 and that affects us as well. Please hold while we try to find a workaround for this problem.

Hi there,

Make sure these packages are not foreign, i.e. that they don't come from PPAs.

The quickest way to do this is to remove/disable all PPAs, and then to ask Software Sources to downgrade foreign packages.

If there aren't please paste the output of their policy, with "apt policy packagename".

Also putting this as a reference: https://bugs.launchpad.net/ubuntu/+sour ... ug/1779687.

Hi everyone,

Don't hesitate to post the result of the command below:
This will highlight which modules fail to build.