@owenc1472 Remove the offending PPA - Then rerun updates.. Right off the offending is hunter-kaller
PPA Removal: Uncheck the offending PPA from "Software and Updates" under the "Other Software" tab..
Uncheck the PPA
Then try running updates again..
You can update from terminal or from Menu > Favorites > Install Updates
Also within the manual
https://www.linuxliteos.com/manual/software.html#pparemDo this for any other PPA with a similar error --- If GIMP errors see the header across top -- See security and Bugs..
I also see Conky - those may give grief, searching the forums will yield plenty of info...