installin ubuntu in kubuntu

[Cheatah 0#@!^]

i tried to install ubuntu 6.06  from the terminal of my kubuntu 6.06,
using the following command:
sudo aptitude install ubuntu-desktop

but the following error came up


Reading package lists... Done
Building dependency tree... Done
Initializing package states... Done
Building tag database... Done
Couldn't find package "ubuntu-desktop".  However, the following
packages contain "ubuntu-desktop" in their name:
  kubuntu-desktop
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.


i had the ubuntu 6.06 cd on my cd drive.
Do i need to connect to internet to do the above installation ?