I'm not sure if this has happened since I upgrade Raspbian from Jessie to Stretch - thought I'd done a Plex update since then.
However, whenever I run apt-get update I now get the following regarding the dev2day...
Hit:1 http://raspbian.raspberrypi.org/raspbian stretch InRelease Ign:2 https://dev2day.de/pms stretch InRelease Err:3 https://dev2day.de/pms stretch Release Hit:4 http://archive.raspberrypi.org/debian stretch InRelease Reading package lists... Done E: The repository 'https://dev2day.de/pms stretch Release' does no longer have a Release file. 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 configuration details.
Anyone point me to what's gone wrong?