The following signatures couldn’t be verified because the public key is not available

When running a ubuntu or debian based distro, it is sometimes required to do same manual updating with the apt-get tool . I run the following command almost on a daily basis on my desktops and servers.

Of course I could also use the auto-update feature but I like to have more control over what and when I update.

A couple of days ago I ran into a situation where a public key of a repository had expired. The console gave me the following results

First I thought there was a problem at te servers of spotify, but doing the following command gave me the answer I was looking for.

The solution in this case was very simple. I removed the expired public key and added the new public key from spotify.

After that’s done I checked the expiration date of the new public key and all was well.

Hopefully this helped somebody with this issue 🙂