[FROG] NO_PUBKEY when updating Frr on Ubuntu 20.04

[Юрий Иванов]

Hi,

I try to install FRR on ubuntu server and it works pretty well after install.
Now when I issue apt update command:
Err:5 https://deb.frrouting.org/frr focal InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74DEED43AB194DBF
Reading package lists... Done
W: GPG error: https://deb.frrouting.org/frr focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74DEED43AB194DBF
E: The repository 'https://deb.frrouting.org/frr focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Target Packages (frr-stable/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/frr.list:1 and /etc/apt/sources.list.d/frr.list:2
W: Target Packages (frr-stable/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/frr.list:1 and /etc/apt/sources.list.d/frr.list:2
W: Target Translations (frr-stable/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/frr.list:1 and /etc/apt/sources.list.d/frr.list:2
W: Target CNF (frr-stable/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/frr.list:1 and /etc/apt/sources.list.d/frr.list:2
W: Target CNF (frr-stable/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/frr.list:1 and /etc/apt/sources.list.d/frr.list:2

Can someone point me how to fix such annoying problem.
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