I used Wubi to download 12.04 on a new partition. When restarting, the computer (Levono windows 7 -64) froze with no signal on my screen. Turning the computer on and off I received the option to sign in on windows or ubuntu. Windows worked well, but Ubuntu seems to bomb again as before. I can look at the new partition where some Ubuntu files exist via Windows explorer. What am I to do? Is 12.04 compatible with windows 7?
By default, Wubi does not install on a different partition. It creates a virtual "hard disk" file within your primary storage drive (typically C:), from which it runs Ubuntu.
If you intentionally instructed it to create this disk on a separate partition of your drive, it could be that Windows is having issues interacting with it. Can you access that partition's letter from Windows (specifically, the Wubi directory, which is X:/ubuntu, where X is the respective drive letter)?
If you simply mistook the function of the Wubi installer, then I'm not quite certain. It could be a corrupted .iso file, or perhaps an incompatible one (I'm not sure if a 64-bit Ubuntu .iso can be installed over a 32-bit Windows system, for example). It could also be that, for whatever reason, Wubi didn't install the grub2 bootloader (the bootloader which appears after you select Ubuntu after boot) correctly.
If I were you, I'd just uninstall Ubuntu through the Control Panel or by running Wubi again (it should prompt you to uninstall), and reinstall it, making sure it is on the same partition as your Windows installation.
edit - It could also be that your hard drive is overly fragmented (though this is unlikely). If none of the above solutions work, running the Windows defrag tool after installation might help.
This is the standard "black-screen-on-boot" that regular Ubuntu users with Nvidia/AMD graphics often have.
You need to do the following from within Windows:
It should look like:
loopback loop0 /ubuntu/disks/root.disk set root=(loop0) search --set=diskroot -f -n /ubuntu/disks/root.disk probe --set=diskuuid -u $diskroot linux /vmlinuz root=UUID=$diskuuid loop=/ubuntu/disks/root.disk preseed/file=/ubuntu/install/preseed.cfg wubi-diskimage ro quiet splash initrd /initrd.img boot
Edit the long bolded
Save, reboot into Wubi-buntu.
Then go to Settings...Additional Drivers, and install the appropriate Nvidia/AMD driver. Once that's done, you can go back to Windows and edit the file again, removing