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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.

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This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. I am flagging this for closure :) – Ringtail Feb 29 '12 at 0:47

closed as too localized by jrg♦ Feb 29 '12 at 0:57

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, see the FAQ.

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Perhaps you might be able to get your system into booting/recovering Windows 7 if you use the Windows 7 CD to boot into Recovery Console, and run the commands fixmbr and fixboot.

Boot the Ubuntu installer by using your Ubuntu CD or USB key and then re-install Ubuntu. You can chose to install Ubuntu over the whole entire disk, or you use the disk partition editor to add/edit/delete disk partitions, you may also delete the entire partition table and all the partitions and start from scratch.

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