I wanted to use Ubuntu alongside my Windows 7, so I installed it from a USB. During installation, it didn't detect my existing Windows. So, I chose "Something Else". From there, I formatted a drive with settings:
Size: 20 Gb
type: primary partition,
file system: ext4.
and mount point: ""
Then I allocated 4GB extra for "swap".
Then I installed Ubuntu and it completed smoothly. Then it asked me to reboot. After rebooting, I was expecting a menu to choose between Linux and Windows, but I didn't get any menu at all. My Windows booted normally.
What do I need to configure to get my dual boot system working?