HandBrake is a multithreaded video transcoder, This will allow us to rip DVD to MP4, MKV, AVI or OGM. It is open source and is under the GPL. To use this program only need the DVD VIDEO_TS folder with the files or a DVD image to pass to the other formats are MP4 and MKV, MPEG-4, H.264, AAC audio or Theora, MP3, Vorbis or AC-3 and DTS.

How to Install in Ubuntu/debian
Download Deb file for ubuntu/Debian Here 32Bit 64Bit
Now double click on deb file and install with gdebi or
Open a terminal and type
$sudo dpkg -i HandBrake-0.9.4-Ubuntu_GUI_i686.deb
Unp is a small perl script which makes extraction of any archive files in easy way. It support several compressors and archiver programs, chooses the right one(s) automatically and extracts one or more files using a single command. It supports rar, zip, tar.gz, deb, tar.gz2, rpm etc..
How to Install unp in ubuntu / Debian
$ sudo apt-get install unp
Usage Method 1 (unpack all archives in a directory)
$ unp *.*
Method 2 (unpack, for example, all .rar archives in a directory):
$ unp *.rar
Method 3 (unpack 1 archive):
$unp archivefile
Method 4 (unpack several archives at the same time):
$unp archivefile1 archivefile 2
More examples
unp *.tar.gz, unp *.tar.bz, unp *.rpm, unp *.deb, unp *.zip, unp *.rar
$man unp ( for more help)
A simple error noted in unp is , It doesn’t extract RAR archives with full path