Yesterday, I installed the new version of Ubuntu (12.04) but in the middle of the installation, it gave me an error and didn't install the rest.
When I restarted my computer, I booted into Ubuntu, but it didn't do anything – just went black.
I restarted my computer again, and when I tried to uninstall Ubuntu (with Windows Vista) the same happened. It did not work. I tried to just delete it or use CCleaner, but it didn't work either.