Buenas tardes, cuando quiero hacer el update en el terminal me da error, me salta este mensaje, tengo Kali Linux:

sudo apt-get update         
[sudo] password for kali:
Ign:1 https://apt.postgresql.org/pub/repos/apt kali-rolling-pgdg InRelease
Err:2 https://apt.postgresql.org/pub/repos/apt kali-rolling-pgdg Release
  404  Not Found [IP: 147.75.85.69 443]
Hit:3 http://kali.download/kali kali-rolling InRelease
Reading package lists... Done
E: The repository 'https://apt.postgresql.org/pub/repos/apt kali-rolling-pgdg Release' does not have a Release file.
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.