OK..I changed the constant 60 to 600, giving HPLIP a full 10 minutes to get access to the system tray. It still failed to get it.
OTOH, while I was waiting for the above 10 minute wait for a system tray, I discovered that there were *three* instances of systemtray.py running!
$ pgrep -a systr 1795 /usr/bin/python3 /usr/bin/hp-systray -x 1908 /usr/bin/python3 /usr/bin/hp-systray -x 1909 /usr/bin/python3 /usr/bin/hp-systray -x
OK..I changed the constant 60 to 600, giving HPLIP a full 10 minutes to get access to the system tray. It still failed to get it.
OTOH, while I was waiting for the above 10 minute wait for a system tray, I discovered that there were *three* instances of systemtray.py running!
$ pgrep -a systr
1795 /usr/bin/python3 /usr/bin/hp-systray -x
1908 /usr/bin/python3 /usr/bin/hp-systray -x
1909 /usr/bin/python3 /usr/bin/hp-systray -x