After a mess up commands,i have got a solution from my friend who fix the Adobe Flex Builder in Linux(Much more easier way).
Create a new directory in /home/username/name of the directory.
Copy both the downloaded file to that directory.
Open up the ‘Terminal’.
Type the command to extract your eclipse.
$ sudo tar xf eclipse-java-europa-winter-linux-gtk.tar.gz
then start the Flex builder installer.
$ sh flexbuilder_linux_install_a4_081408.bin
Locate where you want to install the Flexbuilder and choose where you have your eclipse extracted.
It will be up and running…
Thanks .All credits go to my friend.