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From: Jim Jackson <jj@franjam.org.uk>
Newsgroups: comp.os.linux.misc
Subject: Re: CUPS problem
Date: Sun, 15 Oct 2023 13:15:16 -0000 (UTC)
Organization: A noiseless patient Spider
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On 2023-10-15, Bob Tennent <rdtennent@tennent.ca> wrote:
> On Sun, 15 Oct 2023 11:02:24 +0100, The Natural Philosopher wrote:
> > On 15/10/2023 00:10, Bob Tennent wrote:
> >> I can't print as an ordinary user to either a network
> >> printer or to a shared USB printer connected to another host
> >> on the local network. The Printer State message I get is
> >> 
> >> Idle - Unable to open print file: Permission denied
> >> 
> >> What's baffling is that I can print to both printers as the
> >> superuser. Here's what I get after a failed attempt to print
> >> by doing ls -l /var/spool/cups/*:
> >> 
> >> -r-------- 1 root root   331 Oct 14 18:51 a00711
> >> -rw------- 1 root lp    1539 Oct 14 19:02 c00711
> >> -rw-r----- 1 root lp   50966 Oct 14 18:51 d00711-001
> >> 
> >> and exactly the same after a successful print as root.
> >> 
> >> What is going on?
> >> 
> >> 
> > at a *guess* some directory used by CUPS is only permitted to do so by root.
> > propbaly in the /var/lib or /var/spool hierarchy.
> >
>
> % ls -ld /var/spool/cups
> drwx--x--- 3 root lp 4096 Oct 15 00:00 /var/spool/cups
>
> # ps -eadf | grep cups
> root      254733       1  0 00:00 ?   00:00:00 /usr/sbin/cupsd -l
> lp        254735  254733  0 00:00 ?   00:00:00 /usr/lib/cups/notifier/dbus dbus://
> root      254736       1  0 00:00 ?   00:00:00 /usr/sbin/cups-browsed
> lp        254825  254733  0 00:00 ?   00:00:00 /usr/lib/cups/notifier/dbus dbus://

You should be in the lp group
What is the result of (as user not root) ...

$ groups