Error: no such partition after installing Ubuntu 12.04

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http://askubuntu.com – I'm newbie here. Yesterday I decided to install Ubuntu 12.04 as I have already installed Windows 7 and want to go for dual boot. The problem is it doesn't shows me the boot menu. This is what I get: Quote: Error: no such partition grub rescue> First, I installed it manually and when I saw this message, I started searching for the solution. Tried to fix it many ways - recommended boot repair, manual GRUB2 reinstall, GRUB2 upgrade, ensured that it's in the right dev/sda drive and dev/sda7 partition (in my case), but still the error occurs... Even when I used EasyBCD, I made a Ubuntu boot entry b (HowTos)