cannot update linux lite

[stevef]

Your machine is using some software that has a PPA (Personal Package Archive) in your update list.  PPA aren't part of the supported software repositories.  Unfortunately, if there is a problem with a listed PPA it stops the update process working because the machine cannot find everything on the list.

To remove a failing PPA from the list and allow the rest of the update to work check the manual at

https://www.linuxliteos.com/manual/software.html#pparem

and remove the offending PPA as described there.