Key for signing repos expired
As per documentation:
The repository is currently signed by The Monkeysphere archive signing key, key id EB8AF314 (fingerprint: 2E8D D26C 53F1 197D DF40 3E61 18E6 67F1 EB8A F314).
~/tmp/monkeysign/monkeysign$ sudo apt-key adv --keyserver pool.sks-keyservers.net --recv-key 0x2E8DD26C53F1197DDF403E6118E667F1EB8AF314
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.z0siTGEXLI --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d//jitsi-archive-keyring.gpg --keyserver pool.sks-keyservers.net --recv-key 0x2E8DD26C53F1197DDF403E6118E667F1EB8AF314
gpg: requesting key EB8AF314 from hkp server pool.sks-keyservers.net
gpg: key EB8AF314: public key "Monkeysphere Archive Signing Key (http://archive.monkeysphere.info/debian)" imported
gpg: no ultimately trusted keys found
gpg: Total number processed: 1
gpg: imported: 1 (RSA: 1)
~/tmp/monkeysign/monkeysign$ sudo apt-get update
.... cut ....
Fetched 45.0 kB in 11s (3,831 B/s)
Reading package lists... Done
W: GPG error: http://archive.monkeysphere.info experimental Release: The following signatures were invalid: KEYEXPIRED 1497742030
Edited by Vladimir Vitkov