I am unable to insatall jenkins on ubuntu 20.04 instance

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1

I am unable to insatall jenkins on ubuntu 20.04 instance.
Error
W: GPG error: Debian Jenkins Packages binary/ Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 5BA31D57EF5975CA
E: The repository ‘Debian Jenkins Packages binary/ Release’ 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.

2

Did you add the up-to-date keys from Debian Jenkins Packages?