[arch-general] pacman-key issue

[Frank Zimmermann]

Good evening,

I'm having trouble with my pacman-keyring which in the end prevents me 
from installing signed packages. Here's the output:
pacman-key --populate archlinux
==> Appending keys from archlinux.gpg...
==> Locally signing trusted keys in keyring...
  -> Locally signing key FOO
==> ERROR: FOO could not be locally signed.

Any hints?

Thanks Frank