I confirm having the same issue on Ubuntu 20.04:
yves@laptop:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04.2 LTS"
yves@laptop:~$ dpkg -l | grep -i hplip
ii hplip 3.20.3+dfsg0-2
amd64 HP Linux Printing and Imaging System (HPLIP)
ii hplip-data 3.20.3+dfsg0-2
all HP Linux Printing and Imaging - data files
ii hplip-gui 3.20.3+dfsg0-2
all HP Linux Printing and Imaging - GUI utilities
(Qt-based)
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https://bugs.launchpad.net/bugs/1714659
Title:
HPLIP is not compatible with modern GNOME (No system tray detected on
this system. Unable to start, exiting.)
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