Q:

how to get  ubuntu on  bootloader

I have install C Drive window 7 and E driver Ubuntu. It works fine, when first time rum my computer it comes boot loader(choosing option) which OS do you want run. But some problem in my window 7, after that problem, I format window 7 but boot loader doesn't comes. 
So, How to get Ubuntu in boot loader. 

A:

Use Boot Repair to fix your bootloader.
1 - Live CD
First, you'll need to boot from a Ubuntu Live CD.
2 - Repair the bootloader
To restore the Grub bootloader, follow these steps.
Open a terminal from the Live CD, and run the following commands:
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair
boot-repair

After a few seconds, Boot Repair's main window will open.
Click on Recommended repair.
You're done!
Reboot to test everything out.
If everything went well, you should be up and running now, with both Windows and Ubuntu appearing in the Grub menu.

