I tried to install Ubuntu TV in Ubuntu 12.04 with this guide: https://wiki.ubuntu.com/UbuntuTV/Contributing.
Everything had been OK until I wrote to the terminal
bzr branch lp:~s-team/ubuntutv/trunk ubuntu-tv. It says:
Permission denied (publickey). ConnectionReset reading response for 'BzrDir.open_2.1', retrying Permission denied (publickey). bzr: ERROR: Connection closed: Unexpected end of message. Please check connectivity and permissions, and report a bug if problems persist.