Launchpad itself

public key is not available: NO_PUBKEY 374C7797FB006459

Asked by Daudi Amani

$ sudo add-apt-repository ppa:savoury1/utilities
:
Executing: /tmp/apt-key-gpghome.Cu5jNBnCS5/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys E996735927E427A733BB653E374C7797FB006459
gpg: key 374C7797FB006459: public key "Launchpad PPA for Rob Savoury" imported

$ sudo apt update
:
Err:13 http://ppa.launchpad.net/savoury1/utilities/ubuntu bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 374C7797FB006459
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net/savoury1/utilities/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 374C7797FB006459
E: The repository 'http://ppa.launchpad.net/savoury1/utilities/ubuntu bionic InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

system information:
System: Host: jabari Kernel: 5.4.0-124-generic x86_64 bits: 64 compiler: gcc v: 7.5.0
           Desktop: Xfce 4.14.1 tk: Gtk 3.22.30 wm: xfwm4 dm: LightDM
           Distro: Linux Mint 19.3 Tricia base: Ubuntu 18.04 bionic
Machine: Type: Desktop System: ASUS product: All Series v: N/A serial: <filter>
           Mobo: ASUSTeK model: H87-PRO v: Rev X.0x serial: <filter> BIOS: American Megatrends
           v: 2104 date: 10/28/2014

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Manfred Hampl (m-hampl) said : 		#1

This question has been asked in the area of the launchpad hosting services, which is the software used for managing the bug tracker for Ubuntu and other projects and similar web services.

I do not see any relationship between your question and launchpad hosting.
In my opinion the closest match is the Ubuntu question tracker, but even that is wrong, because Ubuntu support does not deal with Linux Mint.

Support for Linux Mint can be found at https://www.linuxmint.com/contactus.php and https://forums.linuxmint.com/

In case that it helps, the standard answer for problems like yours is https://answers.launchpad.net/launchpad/+faq/662
You can check the status of your apt signature key store with the command
apt-key list

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