How to update expired Skype signing key Yesterday, I received signature expired: Err:24 stable InRelease The following signatures were invalid: EXPKEYSIG 1F3045A5DF7587C3 Skype Linux Client Repository <se-um@microsoft.com> Today the same problem, solutions? I'm on Linux Mint 20.1.

The solution is pretty simple, Microsoft keeps their updated GPG signing key in this file: <

So, one can do for example:


curl -s | sudo apt-key add -


Note: You should not implicitly trust any key (or file for that matter) and inspect the file thoroughly, see this answer for more info. Credit: Stephen Kitt.