How can I reinstall the boot loader?

Question

I've just installed windows 7, and I can't access Ubuntu any more. Is there any way I can install the boot loader without reinstalling Ubuntu all over again ??

Answer 1

You can use boot-repair

Insert your Ubuntu live (desktop) CD or flash drive, reboot your computer from CD/Flash drive into a live, desktop session.

Install and run Boot-Repair

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update 
sudo apt-get install -y boot-repair
gksu boot-repair

Click "Recommended repair" -> apply.

For other options, see https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows