When receiving a warning:
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY XXXXXXXX W: There is no public key available for the following key IDs: XXXXXXXX |
First, retrieve the key:
gpg --keyserver pgpkeys.mit.edu --recv-key XXXXXXXX
Then, import the key for use by apt:
gpg -a --export XXXXXXXX | apt-key add -
Where XXXXXXXX is the key.
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