This bug was fixed in the package ubuntu-mate-artwork - 18.10.1
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ubuntu-mate-artwork (18.10.1) cosmic; urgency=medium
* Add Ubuntu MATE 18.10 community contributed wallpaper.
* A&AD&R: Render window controls are circles in header bar applications.
(LP: #1737591)
-- Martin
** Changed in: ubuntu-mate-artwork (Ubuntu)
Status: In Progress => Fix Committed
** Changed in: ubuntu-mate-artwork (Ubuntu Bionic)
Status: Confirmed => Triaged
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** Also affects: ubuntu-mate-artwork (Ubuntu)
Importance: Undecided
Status: New
** Also affects: ubuntu-mate-artwork (Ubuntu Bionic)
Importance: Undecided
Status: New
** No longer affects: ubuntu-mate
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B
A solution is documented here:
* https://github.com/ubuntu-mate/ubuntu-mate-artwork/issues/26
I will incorporate this into Ubuntu MATE 18.10 and backport to 18.04.
** Changed in: ubuntu-mate-artwork (Ubuntu)
Importance: Undecided => Low
** Changed in: ubuntu-mate-artwork (Ubuntu Bionic)
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-mate-artwork (Ubuntu)
Status: New => Confirmed
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1737591
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-mate-artwork (Ubuntu Bionic)
Status: New => Confirmed
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1