The workaround for Ubuntu MATE versions prior to 22.04 is to remove the `mate-netbook` package. It is Recommended only, so can be safely removed like so:
killall mate-maximus sudo apt-get remove mate-netbook -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu. https://bugs.launchpad.net/bugs/1854383 Title: Extra window decorations are created on windows with client-side decorations. Status in gtk+3.0 package in Ubuntu: Invalid Status in marco package in Ubuntu: Invalid Status in mate-netbook package in Ubuntu: New Status in ubuntu-mate-meta package in Ubuntu: Fix Released Bug description: Steps to reproduce after a minimal/full install of Ubuntu MATE: 1. Start up a Gtk3 application with a header bar (tested with Gnome Software) or a browser (such as Firefox) without using a standard window title bar that saves the position and size of the window before it was closed. 2. Maximize the application window, then close it without changing the window size 3. Relaunch the application and resize/unmaximize it After this, dummy window decorations will be created around the window. This issue has been tested on a Dell XPS 9570 and using Gnome Boxes 3.34. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1854383/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp