GPG error: https://packages.icinga.com/ubuntu icinga-focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY CC116F55AA7F2382

Icinga 2
5

bullseye would be debian:

wget -O icinga-archive-keyring.deb "https://packages.icinga.com/icinga-archive-keyring_latest+ubuntu$(
 . /etc/os-release; echo "$VERSION_ID"
).deb"

apt install ./icinga-archive-keyring.deb

update your icinga-focal.list file with this:

deb [signed-by=/usr/share/keyrings/icinga-archive-keyring.gpg] https://packages.icinga.com/ubuntu icinga-focal main
deb-src [signed-by=/usr/share/keyrings/icinga-archive-keyring.gpg] https://packages.icinga.com/ubuntu icinga-focal main

see here Index of /ubuntu
and here Icinga Package Repository Key Rotation, 2024 - #5 by Al2Klimov

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