Ok, I got it. It's related to bug #131470. Doing "sudo aa-complain cupsd" to deactivate AppArmor protection for CUPS did the trick. Bug can be closed.
Daniel -- Unable to read database - cups renderer permission error https://bugs.launchpad.net/bugs/161177 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
