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I have a hp Probook 4410s with Windows 7 as default OS. For the last two years I have Ubuntu side by side and the latest version was 11.10. I wanted to upgrade to 12.04 by installing wubi, which didn't work (in fact, only thing happened was removal of previous version of Ubuntu). Later I downloaded an iso file and burnt it onto a CD. The laptop didn't start while booting with installation CD. The screen turned blank after some time and that's all while I was able to install 12.04 on my desktop (Win XP, SP-3) with the same CD.

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Why not try making a bootable USB? Also do verify that the iso you downloaded is not corrupt. Refer this help.ubuntu.com/community/HowToMD5SUM – harisibrahimkv May 3 '12 at 9:54
Using wubi was not the correct step, to upgrade Ubuntu. It would have prompted you to 'overwrite/replace' the existing Ubuntu install. Do you know what steps were taken which removed your current install? – david6 May 4 '12 at 9:12

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Why not try making a bootable USB? Also do verify that the iso you downloaded is not corrupt.

How should the iso be corrupt when it installs Ubuntu 12.04 on a desktop??

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