Scratch that - the "Administration" tab worked on another machine
On that machine the cupsd.conf permissions were: -rw-r----- 1 root lp 2253 Jun 22 17:50 /etc/cups/cupsd.conf On the broken machine the cupsd.conf permissions were: -rw-r----- 1 root lpadmin 2282 Jun 28 16:19 cupsd.conf `chown root:lp cupsd.conf` fixed the problem. "Administration" tab & "Edit Configuration File" now work The "Edit Configuration File" error "No such file or directory" was strange & misleading The CUPS installation on the working machine is more recent than the broken machine - perhaps the cupsd.conf permissions changed somewhere in cupsys package history & the old installation never got updated? Jack
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