How to fix the user ID on an old key?

[Alphax]

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Oskar L. wrote:
> Hello,
> 
> I've got an old keypair, generated in 2003 with the current PGP version at
> that time. When I import the secret key, I get:
> 
> gpg: key 75AC881F: no valid user IDs
> gpg: this may be caused by a missing self-signature
> 
> I'm able to get the key to work in gpg, but is there any way to fix it, so
> that I can export it, delete it from the keyring, and re-import it,
> without getting that message? I've tried --allow-non-selfsigned-uid, but
> that doesn't seem to change the key, only the way gpg handles it (when
> exported it's still the same). Included below is the output from pgpdump,
> in case that's of any help.
> 

Re-import it from a keyserver, the copy on the SKS network has a valid
self-sig...

If that doesn't work, gpg --sign 0x75AC881F ...

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