https://exaile.org/forum/viewtopic.php?f=7&t=914
gpg --no-default-keyring --keyring /tmp/.exaile.keyring --keyserver keyserver.ubuntu.com --recv B79BBC58DE219687E584187AC174A7B143CBFCC0
gpg --no-default-keyring --keyring /tmp/.exaile.keyring --export --armor B79BBC58DE219687E584187AC174A7B143CBFCC0 | sudo apt-key add -
rm /tmp/.exaile.keyring
sudo apt-get update