Installed ubuntu from rescue

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http://askubuntu.com – I'm new to ubuntu, After extracting the iso file on the usb drive with the software provided by pendrivelinux.com and tried to install it but i got this error (casper/vmlinuz file not found) in the menu. after that i tried running the "rescue option" and hopefully it worked but the problem is that only shell was install by that there's no GUI :| . I'm tried searching it on internet but i couldn't find anything.I'm totally confused. Is there any way out to get the GUI too ? P.S: I used official ubuntu torrent link to download the iso. (HowTos)