Public Key not available

I tried to update my Raspberry pi 2 by running apt-get update but got the following error:-
W: GPG error: http://www.deb-multimedia.org jessie InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 5C808C2B65558117

Hi,

You can remove this repo by running:

rm /etc/apt/sources.list.d/deb-multimedia.list
rm /etc/apt/sources.list.d/debmultimedia.list
apt-get update

If the issue still occurs, its manually been added and we will need to see the contents of the following:

cat /etc/apt/sources.list
ls -lha /etc/apt/sources.list.d/*

Thank you,it’s updating properly now and thanks for your distro never thought I would find such a lightweight headless easy setup os for raspberry pi. Also have another query which torrent client would you suggest and is in your opinon the best, I will only use it via web-gui.

Also have another query which torrent client would you suggest and is in your opinon the best, I will only use it via web-gui.

Personal opinion, Transmission. Always works, never fails, good performance.

Deluge is bulky and coded in Python (a little on the slow side). qBitTorrent is c++ using QT but buggy (from my experience).

Thank you again for everything you’ve done.