I had a dual boot system with windows 7 and Ubuntu 11.04. The boot loader was Grub 1.99 from which i can select windows 7 or Ubuntu 11.04. It worked very well until last week when I started Ubuntu and followed the prompt to upgrade to 11.10 before make any research.
First, the upgrading to 11.10 was failed. The GUI just stopped there with a watermark saying unsupported hardware - I could not log on.
Then I wanted to get my 11.04 back. I booted from Ubuntu 11.04 USB stick and tried to reinstall ubuntu 11.04 over the upgraded 11.10, but the installation GUI stopped when I clicked continue button after it had confirmed free disk space, power source connection and network connection - I had not chance to reach the screen to allocate disk space. I tried with 11.10 Live CD to install, but the installation program stopped there as well.
Then I guessed perhaps I should remove the old installation of Ubuntu before new installation, and then I deleted ext4 partitions, but I still could not make install program run, and I had broken my Grub boot loader!
Now I cannot boot into Window 7, and cannot install Ubuntu. I really need help!
My system: Acer aspire 7750G, i7-2630QM, AMD Radeon HD 6850M 1GB.