I still have the issue.
My SSH key is password-protected and I have a valid .pub file. (BTW it's
a DSA key)
--
ssh always asks to unlock private key with no password set
https://bugs.launchpad.net/bugs/187127
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Desktop Bugs,
Here's another clue: this issue started to occur on my system (8.10)
after I've changed my password. It worked fine before. I found the same
messages in my /var/log/auth.log as SteveLoughran. The only difference
to before the password change are the last to lines:
Apr 4 07:05:55 seawind