Public bug reported:
Binary package hint: hplip
After installing libsane, my configured printer (which uses hplip) stopped
working.
The printer in question is a multifunction HP PSC-750 (a combined printer and
scanner).
I have tracked the issue to a permissions problem:
* Package hplip creates user hplip with group lp
* As long as libsane is not installed, /etc/udev/rules.d/40-permissions.rules
creates /dev/usblp0 with uid=root, gid=lp
* libsane installs /etc/udev/rules.d/45-libsane.rules, which causes group
ownership of /dev/usblp0 to be gid=scanner
After the above sequence, user hplip (which runs the hpiod daemon) no
longer has access to /dev/usblp0...
Performing a manual "usermod -a -G scanner hplip" solved the issue
(manually).
** Affects: hplip (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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installation of libsane causes hplip to stop working
https://launchpad.net/bugs/79631
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