Hplip started showing message "no system tray detected"
After latest update with synaptic, HPLIP icon disappeared from indicators applet and at system startup the "no system tray detected" popup regularly appears. I had this problem with Ubuntu 12.04 (with Mate desktop), but disappeared when I installed Ubuntu Mate 16.04. Until latest update which involved many Mate modules.
Problem appeared with HPLIP default version 3.16.3 installed. I tried update to HPLIP 3.16.8 with no luck. Problem is still present.