ubuntu upgrade problem

[jyaapu]

Hey, so i'm running ubuntu 12.10 and wanted to upgrade to gnome remix for 12.10 but when i type this command:
"sudo apt-get install ubuntu-gnome-desktop ubuntu-gnome-default-settings"

i get an error:

Package ubuntu-gnome-default-settings is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Package ubuntu-gnome-desktop is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

i'm new to linux and don't know what i'm supposed to do.
any help is much appreciated.
thanks

[dino99]

do a fresh clean remix install (too much differences with the standard ubuntu)