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Err:4 http://deb.i2p2.no unstable InRelease The following signatures were invalid: EXPKEYSIG 67ECE5605BCF1346 I2P Debian Package Repository
to look for expired keys
sudo apt-key list
you will get something like this
pub dsa1024 2007-03-08 [SC] 4CCA 1EAF 950C EE4A B839 76DC A040 830F 7FAC 5991 uid [ unknown] Google, Inc. Linux Package Signing Key sub elg2048 2007-03-08 [E]
copy this ID on above
4CCA 1EAF 950C EE4A B839 76DC A040 830F 7FAC 5991
remove spaces
4CCA1EAF950CEE4AB83976DCA040830F7FAC5991
add to the end of this command
sudo apt-key adv --keyserver keys.gnupg.net --recv-keys 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991
