This is gtk-nocsd bug. Gtk-nocsd is not compatible with new HdyWindow. The debian version is unmaintained as of now.
The new code is https://github.com/ZaWertun/gtk3-nocsd. Perhaps one can try with that library. Note: If you install gnome-session you will need this patch from https://bugs.launchpad.net/ubuntu/+source/gtk3-nocsd/+bug/1745206 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-system-monitor in Ubuntu. https://bugs.launchpad.net/bugs/1921583 Title: Can't run System Monitor in Ubuntu Unity 21.04 To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-system-monitor/+bug/1921583/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
