Computer will not update - PPA

[Rapidrob]

Welcome to Linux Lite 5.2 rapidrob

Monday 18 September 2023, 08:41:01
Memory Usage: 1065/7944MB (13.41%)
Disk Usage: 25/457GB (6%)
Support - https://www.freecinema2022.gq/forums/ (Right click, Open Link)

 rapidrob  ~  sudo apt-get update | tee ~/"$(date +"%Y_%m_%d_%T")-apt-get-update.txt"
[sudo] password for rapidrob:
Get:1 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit:2 http://repo.linuxliteos.com/linuxlite emerald InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://ppa.launchpad.net/dupeguru/ppa/ubuntu focal InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu focal InRelease
Get:6 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Ign:7 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal InRelease
Get:8 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Get:9 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages [2,434 kB]
Err:10 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release
  404  Not Found [IP: 185.125.190.52 80]
Get:11 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages [646 kB]