[Merge] ~dgadomski/ubuntu/+source/gdm3/+git/lp1782152:bionic into ~ubuntu-desktop/ubuntu/+source/gdm3:ubuntu/bionic

[Iain Lane]

(An advantage of taking the new upstream release is that we can then use the SRU exception to not have to verify that fix explicitly.)
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https://code.launchpad.net/~dgadomski/ubuntu/+source/gdm3/+git/lp1782152/+merge/352976
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