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Re: apache2 missing a file, won't run.

On Mon, May 06, 2019 at 04:24:45PM +0100, Brian wrote:
> On Mon 06 May 2019 at 09:43:16 -0400, Greg Wooledge wrote:
> > Log out and back in to acquire the new privileges in your interactive
> > session.
> >
> > However, in the case of CUPS via loopback HTTP, I don't know whether
> > that's actually required.  The CUPS daemon may take the privileges
> > directly from the /etc/{passwd,group} files.
> It is required and conspicuously documented for all users, including
> experienced ones, if they can be bothered to do read it. For example,
> in the cups README.Debian.
>   'Administration' is where you need to be to set up a local print queue.
>   At some point you will be required to authenticate. A User Name of 'root'
>   and root's password is always acceptable. Any other user must be a member
>   of the lpadmin group.

I don't see any part of that paragraph that says whether you have to log
out and back in, between adding yourself to the lpadmin group and using
the CUPS web interface.

I've only ever used root for this, so I don't know from experience either.