Katoolin3 running problem at Ubuntu 20.04

[Yakub Sadlil]

When I try to open katoolin3 by typing 'sudo katoolin3' it shows the following error.
How can I repair it? I'm using Ubuntu 20.04, dual booting with Windows 10.

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Err:12 http://ppa.launchpad.net/noobslab/apps/ubuntu focal Release
404 Not Found [IP: 91.189.95.85 80]
Hit:10 http://kali.download/kali kali-rolling InRelease
Reading package lists...

E: The repository 'http://ppa.launchpad.net/noobslab/apps/ubuntu focal Release' does not have a Release file.
Apt update failed

 

[wizardfromoz]

For the benefit of helpers, there is some background here at @Tolkem 's thread

https://linux.org/threads/katoolin3-install-kali-linux-tools-in-debian-ubuntu-distros.28880/

Good luck Yakub

Wizard