clean installation of Sparky 3.6 64bit Xfce
sudo apt-get update
and I get this warning:
W: GPG error: http://deb-multimedia.org testing InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5C808C2B65558117I resolve with this commands:
Quotesudo apt-get -f install
sudo apt-get install deb-multimedia-keyring
sudo apt-get update
;)
I wrote about it a while ago on FB and G+ communities. Sometimes a simple installation of deb-multimedia-keyring is not enough (like when you haven't updated for a long time). What you need to do then is to install the recent deb-multimedia-keyring package manually via dpkg and then do an apt-get update.