می تونی از keryx استفاده کنی :
http://keryxproject.org (http://keryxproject.org)
Keryx is a free and open source tool for easily managing packages on offline Debian based computers including support for Ubuntu and Linux Mint.
یا از این لینک استفاده کن، خوب توضیح داده :
http://askubuntu.com/questions/150127/how-do-i-install-kde-or-xfce-or-lxde-to-an-ubuntu-12-04-system-with-no-internet (http://askubuntu.com/questions/150127/how-do-i-install-kde-or-xfce-or-lxde-to-an-ubuntu-12-04-system-with-no-internet)