Comment 18 for bug 1770027

This effects me as well :
Ubuntu 19.10

bill@asus:~$ hp-systray -xg

HP Linux Imaging and Printing System (ver. 3.19.11)
System Tray Status Service ver. 2.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

hp-systray[15618]: debug: Locking: /home/bill/.hplip/hp-systray.lock
hp-systray[15618]: debug: Creating pipe: hpssd (5) ==> systemtray (4)
hp-systray[15618]: debug: Creating pipe: hpssd (7) ==> hpdio (4)
hp-systray[15618]: debug: Creating pipe: hpdio (9) ==> hpssd (8)
hp-systray(hpdio)[15620]: debug: PID=15620
hp-systray(hpssd)[15619]: debug: PID=15619
hp-systray(hpssd)[15619]: debug: Entering main dbus loop...
hp-systray(qt4)[15618]: debug: PID=15618
hp-systray(qt4)[15618]: debug: Loading user settings...
hp-systray(qt4)[15618]: debug: FAB command: /usr/bin/hp-fab
hp-systray(qt4)[15618]: debug: Scan command: /usr/bin/xsane -V %SANE_URI%
hp-systray(qt4)[15618]: debug: Auto refresh: False
hp-systray(qt4)[15618]: debug: Auto refresh rate: 30
hp-systray(qt4)[15618]: debug: Auto refresh type: 1
hp-systray(qt4)[15618]: debug: Systray visible: 0
hp-systray(qt4)[15618]: debug: Systray messages: 0
hp-systray(qt4)[15618]: debug: Last used device URI:
hp-systray(qt4)[15618]: debug: Last used printer:
hp-systray(qt4)[15618]: debug: Working directory: .
hp-systray(qt4)[15618]: debug: Exception: 4 (Unknown/invalid device-uri field)
No systemtrayicon available
hp-systray(qt4)[15618]: debug: handle_hplip_updation upgrade_notify =0
hp-systray(qt4)[15618]: debug: upgrade notification is disabled in systray
hp-systray(qt4)[15618]: debug: Running hp-upgrade: /usr/bin/hp-upgrade

HP Linux Imaging and Printing System (ver. 3.19.11)
HPLIP upgrade latest version ver. 1.0

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

error: No system tray detected on this system. Unable to start, exiting.
hp-systray(qt4)[15618]: debug: Unlocking: /home/bill/.hplip/hp-systray.lock