This is the error i get when trying to run the system monitor from a terminal:
ubuntu@ubuntu:~$ gnome-system-monitor (gnome-system-monitor:5412): Gtk-WARNING **: 17:49:22.082: Theme parsing error: gtk.css:6083:16: Junk at end of value for color (gnome-system-monitor:5412): Gtk-CRITICAL **: 17:49:22.765: gtk_box_pack: assertion '_gtk_widget_get_parent (child) == NULL' failed (gnome-system-monitor:5412): Handy-ERROR **: 17:49:22.941: gtk_window_set_titlebar() is not supported for HdyWindow Trace/breakpoint trap (core dumped) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to 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/ubuntu/+source/gnome-system-monitor/+bug/1921583/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs