I think this was fixed in 18.04 recently, probably by:
https://launchpad.net/ubuntu/+source/ubuntu-themes/16.10+18.04.20180328-0ubuntu1
** Changed in: ubuntu-themes (Ubuntu)
Status: Confirmed => Fix Released
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-themes (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1717449
Title
