Ubuntu screen goes blank after upgrade to 9.04 (beta)

[yankeeDDL]

Hello,

I used Ubuntu 8.10 on Windows XP host (VBox ver 2.1.4).
I have recently upgraded to Ubuntu 9.04 beta and I haven't been able to get X started since.
Splash screen is disabled so I see all the startup commands being executed. No problems or errors reported. The "login" line shows for a very short time before the screen goes completely blank.
I have tried to change the xorg.conf file (there's a .failsafe version in /etc/X11) but no improvements.

I don't know how to debug this problem (I'm quite new to Linux).

Can anybody help?

Thanks in advance.

[Sasquatch]

The issue is most likely the driver for X itself. 9.04 uses a new Xserver version compared to 8.10, so you need to install the GA again. See the Jaunty GA topic in Linux Guests.

[yankeeDDL]

Thanks Sasquatch.
I'll try to find out how to do what you ask me to do (not sure what "GA" is) ...

[yankeeDDL]

Ah, I see: GA = Guest Additions.
I mounted the ISO in the virtual drive but it doesn't look like Unubtu sees it (can't find it in the /mnt, /media or in the /cdrom folders.
Perhaps I need to mount it by hand?

[Sasquatch]

That's where my howto comes to play. Check the VirtualBox FAQ, it has a link. Or just look at the Linux Guests forum.

[roadSurfer]

Thanks for this. The answer is easy when you know how!

In my case I knew enough to know what the problem was, but not enough to get the GAs installed from the command line (my knowledge is still patchy).