Can confirm this is still a bug on Mate Desktop Environment 1.12.1. No Wi-Fi/Networking widget in the system try and running "sudo nm- applet" causes this response:
Gdk-CRITICAL **: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendents_freeze_count >0' failed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1575684 Title: nm-applet keep disappearing with ubuntu-mate raspberry pi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-applet/+bug/1575684/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs