[Merge] ~vanvugt/ubuntu/+source/mutter:fix-lp1832138 into ~ubuntu-desktop/ubuntu/+source/mutter:ubuntu/bionic

[Daniel van Vugt]

The fix is for bionic because the bug only exists in kernels older than 4.17.
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https://code.launchpad.net/~vanvugt/ubuntu/+source/mutter/+git/mutter/+merge/369083
Your team Ubuntu Desktop is requested to review the proposed merge of ~vanvugt/ubuntu/+source/mutter:fix-lp1832138 into ~ubuntu-desktop/ubuntu/+source/mutter:ubuntu/bionic.