software update

[shedendman]

Apologies if this is in the wrong place
I've just updated and got this error message

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.freecinema2022.gq/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Hit:1 http://archive.canonical.com/ubuntu bionic InRelease
Hit:2 http://gb.archive.ubuntu.com/ubuntu bionic InRelease
Get:3 http://gb.archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Get:4 http://gb.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit:5 http://www.mirrorservice.org/sites/repo..../linuxlite diamond InRelease
Get:6 http://gb.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Ign:7 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:8 http://dl.google.com/linux/chrome/deb stable Release
Ign:9 http://ppa.launchpad.net/lubuntu-desktop/ppa/ubuntu bionic InRelease
Hit:10 https://repo.skype.com/deb stable InRelease
Hit:11 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Hit:12 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Err:13 http://ppa.launchpad.net/lubuntu-desktop/ppa/ubuntu bionic Release
  404  Not Found [IP: 91.189.95.83 80]
Reading package lists...
E: The repository 'http://ppa.launchpad.net/lubuntu-desktop/ppa/ubuntu bionic Release' does not have a Release file.
1st time i've had a message like this
So,whats the answer
Thanks