FileBot is a useful tool to have if you need to organize your TV or movie video files or need to download subtitles. It is available on the Ubuntu Software Center as a paid app. However, it can be installed for free from the packages offered for download on their webpage.
For example, to download subtitles, click the Subtitles tab. Type or paste in the name, choose the language, search and download. Takes out all the grunt work.
Note that the 4.5.x versions of Filebot require Java 8 JRE to be available. Older 4.2.x versions works fine with older Java versions.
Tried with: FileBot 4.2 and Ubuntu 14.04