I got this a while back and so decided to do a fresh install of jitsi as
recommended by using the last deb and upgrading. However, the repo key
still seems invalid
W: GPG error: http://download.jitsi.org/deb unstable/ Release: The
following signatures were invalid: 040F57608F84BAF1BF844A62C697D823EB0AB654
E: The repository 'http://download.jitsi.org/deb unstable/ Release' is
N: Updating from such a repository can't be done securely, and is
therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user
This was brought up AGES ago
When are you going to get your act together or are you just abandoning
Debian as a platform?
It's a tough job, but some mug has to do it...