Computer will not update - PPA

[Rapidrob]

Turns out the command line will no longer update as well.
Welcome to Linux Lite 5.2 rapidrob

Friday 15 September 2023, 11:15:55
Memory Usage: 1077/7944MB (13.56%)
Disk Usage: 25/457GB (6%)
Support - https://www.linuxliteos.com/forums/ (Right click, Open Link)

 rapidrob  ~  sudo apt update
[sudo] password for rapidrob:
Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://repo.linuxliteos.com/linuxlite emerald InRelease                 
Hit:3 http://archive.canonical.com/ubuntu focal InRelease                     
Hit:4 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease             
Hit:5 http://security.ubuntu.com/ubuntu focal-security InRelease   
Hit:6 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:7 http://ppa.launchpad.net/dupeguru/ppa/ubuntu focal InRelease
Ign:8 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal InRelease
Err:9 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release
  404  Not Found [IP: 185.125.190.52 80]
Reading package lists... Done
E: The repository 'http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal 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.
 rapidrob  ~  100 