via: http://www.webupd8.org/2014/05/install-popcorn-time-in-ubuntu-or.html
To add the WebUpd8 Popcorn Time PPA and install the app in Ubuntu / Linux Mint (and elementary OS along with Ubuntu derivatives: Xubuntu, Kubuntu, etc.), use the following commands:
$ [sudo] add-apt-repository ppa:webupd8team/popcorntime
$ [sudo] apt-get update
$ [sudo] apt-get install popcorn-time
To install Popcorn Time from the WebUpd8 PPA repository in Debian, use the following commands:
su -
echo "deb http://ppa.launchpad.net/webupd8team/popcorntime/ubuntu trusty main" | tee /etc/apt/sources.list.d/webupd8team-popcorntime.list
echo "deb-src http://ppa.launchpad.net/webupd8team/popcorntime/ubuntu trusty main" | tee -a /etc/apt/sources.list.d/webupd8team-popcorntime.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
apt-get update
apt-get install popcorn-time
exit
NOOO!!!!! my tarball instalations never work :-(