Public bug reported:
Binary package hint: cupsys
Ubuntu 7.10
local printer attached via USB.
On upgrading to gutsy and rebooting, printing no longer worked. My
printer is set up with a 3rd party driver (ptouch), and the ppd file
sets up a "foomatic-rip" line with gs output piped to "rastertoptch".
This driver gets installed into /usr/local/lib/cups/filter/rastertoptch
and has a symlink to it from /usr/local/bin.
After bumping up cupsd's logging, I see messages like "/bin/bash:
/usr/local/bin/rastertoptch: Permission Denied" in cups's error_log. I
could not for the life of me figure out why it was denied, but I
eventually got it working by copying this binary to /usr/bin.
After wasting those hours, I have just discovered bug #131470 and now know that
this problem is due to cupsd's "app armor" settings.
In particular, /etc/apparmor.d/usr.sbin.cupsd does not allow any read access to
/usr/local/lib or /usr/local/bin.
So, this bug could be fixed by:
1) adding read-only access to a bit more of /usr/local in cupsd's apparmor
settings, and
2) mentioning app-armor somewhere in /usr/share/doc/cupsys so poor sysadmins at
least have a tiny hint as to what is happening.
** Affects: cupsys (Ubuntu)
Importance: Undecided
Status: New
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gutsy cupsys apparmor breaks filters in /usr/local
https://bugs.launchpad.net/bugs/160092
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