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I have one expired key which I'm trying to update : 

$ LANG=C apt-key list | grep expired
pub   2048R/8719FCE4 2016-09-28 [expired: 2018-12-07]
$ sudo apt-key del 8719FCE4
OK
$ LANG=C apt-key list | grep expired
$ sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 8719FCE4
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.89FHZwuz0m --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring ...
 --recv-keys --keyserver keyserver.ubuntu.com 8719FCE4
gpg: requesting key 8719FCE4 from hkp server keyserver.ubuntu.com
gpg: key 8719FCE4: public key "home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
$ sudo apt-get update 
Ign http://ppa.launchpad.net trusty InRelease
...
W: GPG error: http://download.opensuse.org  Release: The following signatures were invalid: KEYEXPIRED 1544201334
W: Failed to fetch http://build.openvpn.net/debian/openvpn/stable/dists/trusty/main/binary-i386/Packages  403  Forbidden [IP: 146.112.61.106 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.
$ LANG=C apt-key list | grep expired
pub   2048R/8719FCE4 2016-09-28 [expired: 2018-12-07]

This 8719FCE4 key that I just re-downloaded from keyserver.ubuntu.com seems to be expired.

How can I fix this ?

SebMa
  • 2,291

1 Answers1

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After a little of learning how to use GnuPG, it appears that this 8719FCE4 key has not been updated on keyserver.ubuntu.com since it expired therefore the only solution is to wait for the key to be updated : 

$ gpg --batch --search-keys --keyserver keyserver.ubuntu.com 8719FCE4
gpg: searching for "8719FCE4" from hkp server keyserver.ubuntu.com
q(1)    home:stevenpusser OBS Project <home:stevenpusser@build.opensuse.org>
      2048 bit RSA key 8719FCE4, created: 2016-09-28, expires: 2018-12-07 (expired)
Keys 1-1 of 1 for "8719FCE4".  gpg: Sorry, we are in batchmode - can't get input
SebMa
  • 2,291