The systray applet should not be started if the hplip-gui package (this
one requires python-qt3) is not installed. The autostarter file for the
systray applet, /etc/xdg/autostart/hplip-systray.desktop, is in hplip-
gui. Also menu entries for GUI apps, like hp-ttolbox are only in hplip-
gui.

Tools run in text mode should not trigger the systray applet. Is this
the case?

If the applet is triggered by a non-GUI process (does the hpfax CUPS
backend trigger it when it receives a job?) then the applet should exit
gracefully. putting a decent error message into an appropriate log file
(like /var/log/syslog). If it crashes, it triggers the automatic bug
reporter Apport in Ubuntu (and perhaps also similar things in other
modern distros). The caller should also handle this case gracefully and
issue a decent error message (for CUPS backends or filters drop it in
/var/log/cups/error_log).

-- 
systray.py crashed with IusernameportError in <usernameodule>()
https://bugs.launchpad.net/bugs/269915
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