There is a problem with running Ubuntu on the Asus C90S: as it has a resolution of 1680x1050, during or just after installation, something goes wrong with the bootsplash or framebuffer display. The Asus has a Nvidia 8600 GT (for the record...)

 The result is that you have to wait until X comes up with the login screen. So you don't see intermediate results. Another problem is that the console windows under Alt-F1 until Alt-F6 will not display. (You can circumvent the latter part by doing a sudo modprobe vesafb)

 I've tried many things, but this list gives an idea what to change to get it to work:

1. Make sure /etc/usplash.conf is the same as the resolution you try to display at start.
2. Make sure your vga=XXX is equal to the value for the resolution (make sure it's the same as in the previous step)
3. Make sure /etc/modules.conf contains vesafb
4. Make sure /etc/initramfs-tools/modules contain fbcon and vesafb
5. Do a sudo update-initamfs -u
6. I also did a depmod -a but I don't think this is really needed.