Transmission is my favorite BitTorrent Client in Ubuntu, so far. One day, Transmission cannot be started. When I click on the icon, nothing happen. And i cannot re-install it, using both Ubuntu Software Center and Synaptic Package Manager.
Finally, I re-install it using the commands:
$sudo add-apt-repository ppa:transmissionbt/ppa
$sudo apt-get update
$sudo apt-get install transmission
It's work again now:)