Downverter is a free and fast YouTube Downloader. DownVerter allows you to choose between mkv and mp4 files to download from YouTube. You could choose to just download the file or download it convert it into MP3, AVI, 3GP, MP4, MOV or WMV format.DownVerter is the only download and convert YouTube application that runs on Windows XP, Vista, 7, Mac OS X Leopard, Snow Leopard, Lion and Ubuntu 11.04 32bit and 64bit.
Other Youtube downloader’s available in the Market :
How to Install :
Click the below link to download the Deb package and Double click it to install on your computer .It’s available in two versions for Ubuntu 11.10 :
a) Ubuntu 11.10 64 Bit :
b) Ubuntu 11.10 32 Bit :
[ Via Link]