Vladimir,

Vladimir Zhbanov 写道：
> And JFYI:
> ...
> gpg: Note: signature key 090B11993D9AEBB5 expired Mon Feb 18 
> 16:18:37 2019 MSK
> gpg: Note: This key has expired!

Only your local copy of that key is out of date.

You can refresh your entire keyring with

  $ gpg --refresh-keys

or fetch only Ludo's key directly from Savannah:

  $ curl -L 
  'https://savannah.gnu.org/people/viewgpg.php?user_id=15145' | 
  gpg --import

HTH,

T G-R