Unable to install updates - spotify repository key

[martyrogers]

==========================
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 noble InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu noble-updates InRelease
Hit:3 http://us.archive.ubuntu.com/ubuntu noble-backports InRelease
Hit:4 https://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 https://packages.microsoft.com/repos/edge stable InRelease
Hit:6 http://security.ubuntu.com/ubuntu noble-security InRelease
Hit:7 http://repo.linuxliteos.com/linuxlite galena InRelease
Hit:8 https://packages.mozilla.org/apt mozilla InRelease
Hit:9 https://ppa.launchpadcontent.net/mozillateam/ppa/ubuntu noble InRelease
Get:10 http://repository.spotify.com stable InRelease [3,316 B]
Hit:11 https://ppa.launchpadcontent.net/mozilla...ext/ubuntu noble InRelease
Err:10 http://repository.spotify.com stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY C85668DF69375001
Reading package lists...
W: https://ppa.launchpadcontent.net/mozilla.../InRelease: Signature by key 0AB215679C571D1C8325275B9BDB3D89CE49EC21 uses weak algorithm (rsa1024)
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 C85668DF69375001
E: The repository 'http://repository.spotify.com stable InRelease' is not signed.
W: https://ppa.launchpadcontent.net/mozilla.../InRelease: Signature by key 0AB215679C571D1C8325275B9BDB3D89CE49EC21 uses weak algorithm (rsa1024)

[stevef]

Looks like the spotify security key needs updating (or adding).

Open a terminal by pressing Ctrl Alt and T together.
Enter this command to get the new spotify key and install it.

Code:

sudo curl -sS https://download.spotify.com/debian/pubkey_C85668DF69375001.gpg | sudo gpg --dearmor --yes -o /etc/apt/trusted.gpg.d/spotify.gpg

You may need to enter your password.
Follow any on-screen instructions to confirm the action.

Then try running the update/upgrade again.