xorg problem-window system blocks

[cancrena]

hello everybody
i'm new here, and quite noob in linux, but i'm learning fast... but i have a big problem:

i installed nubuntu 8.12 (ubuntu8.10 based) which worked very well on the live cd, but...
after installation, when i'm in the terminal, i type startx, and screen stucks on a grey screen, showing only mouse arrow (if i move mouse, the arrow hangs around)...
i pressed ctrl+alt+F1 and i could read this in console:

(==) log file:"/var/log/Xorg.0.log", time [date and time i executed startx]
(==) using config file:"/etc/X11/xorg.conf"
ERROR setting MTRR (base = 0xd0000000, size = 0x10000000, type = 1) invalid argument (22)
(EE) AIGLX error: dlopen of /usr/lib/dri/swrast_dri.so failed (/usr/lib/dri/swrast_dri.so: cannot open shared object file: no such file or directory)
(EE) GLX: could not load software renderer
the Xkeyboard keymap compiler (XKBCOMP) reports:
> warning:           type "one_level" has 1 level, but <ralt> has 2 symbols
>                        ignoring extra symbols
                      [it says keyboard is not a big problem]

does anybody know how to fix this? everytime i install that nubuntu it happens, but when i boot the nubuntu live cd it goes all ok... either a persistent usb install has the same problem...
thanks in advance for the support!

[MikeTbob]

Hello and Welcome
It could be a graphics driver problem, install the correct driver for your card and see if it helps.

[cancrena]

my graphic card is nvidia geforce 8600m gt, on normal ubuntu (9.04) it uses proprietary drivers, version 180, but i don't know the name of the package to apt-get... could you tell me? under backtrack was nvidia-driver, but it was another repository and another version, in fact i tryed but could get anything...

[coopstah13]

it depends on what is available in the repository, but it should start with nvidia-glx you should be able to find out by doing

sudo apt-cache search nvidia-glx

[cancrena]

thank you very much!! i'm going to try it right now, then i'll report hehe

---UPDATE---

i installed nvidia drivers (version 177, the most recent available in those repository) and started nvidia-xconfig: it reported a broken xorg.conf and created a new one, then startx showed the nvidia screen, and got stucked again on the grey screen with mouse arrow

ctrl+alt+f1 shows news, old problems solved but now i have a

(EE) failed to load the module "type 1" (module does not exist, 0)

what could this be?