Thanks for all the suggestions!
I've now worked out what happened: when using usermod -G to add myself to
the lpadmin group, I inadvertently *replaced* my membership of the admin
group.
Solution: Recovery mode, usermod -G for both groups, re-boot.
Lessons have been learned......
Chris.
> --
> Please post to: Hampshire@???
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> LUG URL: http://www.hantslug.org.uk
> --------------------------------------------------------------
>