Thunderbird--Ubuntu 14.04

[Michael B. Harris]

I have not been able to get OpenPGP to work under Ubuntu 14.04, using
Thunderbird. Everything in the
setup seems correct. I always get an error message when trying to sign
outgoing mail. Note: Everything
worked fine under Ubuntu 13.1.  Any hints or tips?

Error Message: <user> key not found or not valid.

-- 
  Sincerely;
Michael B. Harris
Linux User# 1063