[Merge] ~dgadomski/ubuntu/+source/gdm3/+git/lp1782152:unblock-sigusr1 into ~ubuntu-desktop/ubuntu/+source/gdm3:ubuntu/bionic

[Iain Lane]

I just pushed this branch without ce4a95af00d3f2174bf10827e75b54bf5fde2154 and added a changelog entry for that change on top. Thanks!
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https://code.launchpad.net/~dgadomski/ubuntu/+source/gdm3/+git/lp1782152/+merge/353089
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