Will not update

[madscientist2]

===========================
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://us.archive.ubuntu.com/ubuntu bionic InRelease
Get:2 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Ign:3 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 http://archive.canonical.com/ubuntu bionic InRelease
Get:6 http://dl.google.com/linux/chrome/deb stable Release [943 B]
Get:7 http://dl.google.com/linux/chrome/deb stable Release.gpg [819 B]
Get:8 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit:9 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Err:7 http://dl.google.com/linux/chrome/deb stable Release.gpg
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13
Get:10 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Get:4 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease [15.4 kB]
Hit:11 http://repo.linuxliteos.com/linuxlite diamond InRelease
Reading package lists...
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/chrome/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13
E: Repository 'http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease' changed its 'Label' value from 'gimp' to 'gimp stable'