Update Ubuntu, NO_PUBKEY, GPG error, The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3C9356BBA2E41F10

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If you get the following NO_PUBKEY error

sjam@kh:~# sudo apt update
Hit:1 http://archive.ubuntu.com/ubuntu bionic InRelease
Hit:3 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:4 http://archive.ubuntu.com/ubuntu bionic-security InRelease
Get:2 http://debian.koha-community.org/koha stable InRelease [49.7 kB]
Err:2 http://debian.koha-community.org/koha stable InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3C9356BBA2E41F10
Reading package lists... Done
W: GPG error: http://debian.koha-community.org/koha stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 3C9356BBA2E41F10
E: The repository 'http://debian.koha-community.org/koha stable 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.

sjam@kh:~# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3C9356BBA2E41F10


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