یا لیست مخازن ات به روز نیست و یا انیکه اصلا کامل نیست!
ی ترمینال باز کن و این دستور رو بزن::
$ gksudo gedit /etc/apt/sources.list
حالا همه ی این خط هایی رو که میدم ب انتهای اون فایل اضافه کنید::
deb http://archive.canonical.com/ubuntu gutsy partner
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy main restricted
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy multiverse
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-security main restricted
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-security multiverse
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-security universe
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy universe
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse
deb http://ir.archive.ubuntu.com/ubuntu/ gutsy-updates universe
deb-src http://archive.canonical.com/ubuntu gutsy partner
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-backports main restricted universe multiverse
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy main restricted
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy multiverse
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-security main restricted
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-security multiverse
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-security universe
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy universe
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-updates main restricted
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-updates multiverse
deb-src http://ir.archive.ubuntu.com/ubuntu/ gutsy-updates universe
فایل رو ذخیره کنید و خارج . و بعد دستور::
$sudo apt-get uptate
حالا ببینید میشه اون بسته هارو نصب کرد یا نه::
$ sudo apt-get install nvidia-glx-new