просто выполни последовательность команд, которые я сказал. в дистрибутиве нет установки гнома - надо слить с сайта
[root@localhost ~]# apt-get update
Reading Package Lists... Done
Building Dependency Tree... Done
[root@localhost ~]# apt-get upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
0 upgraded, 0 newly installed, 0 removed and 0 not upgraded.
[root@localhost ~]# apt-get install gnome-full
Reading Package Lists... Done
Building Dependency Tree... Done
E: Couldn't find package gnome-full
[root@localhost ~]#