Spotify Not Updating

[Manish Jha]

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

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

Hit:1 http://ppa.launchpad.net/nathan-renniewa...lux/ubuntu bionic InRelease
Hit:2 http://archive.canonical.com/ubuntu bionic InRelease
Hit:3 http://linux.teamviewer.com/deb stable InRelease
Ign:4 http://dl.google.com/linux/chrome/deb stable InRelease
Get:5 http://repository.spotify.com stable InRelease [3,316 B]
Hit:6 http://us.archive.ubuntu.com/ubuntu bionic InRelease
Ign:7 http://linux.dropbox.com/ubuntu bionic InRelease
Hit:8 http://ppa.launchpad.net/otto-kesselgulasch/gimp/ubuntu bionic InRelease
Hit:9 http://linux.dropbox.com/ubuntu bionic Release
Hit:10 http://us.archive.ubuntu.com/ubuntu bionic-security InRelease
Hit:11 http://repo.linuxliteos.com/linuxlite diamond InRelease
Hit:12 http://ppa.launchpad.net/teejee2008/ppa/ubuntu bionic InRelease
Hit:13 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:14 http://dl.google.com/linux/chrome/deb stable Release
Hit:15 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease
Err:5 http://repository.spotify.com stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4773BD5E130D1D45
Reading package lists...
W: GPG error: http://repository.spotify.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4773BD5E130D1D45
E: The repository 'http://repository.spotify.com stable InRelease' is not signed.