Dual Boot Option not working


I have installed Ubuntu 16.4 LTS in legacy mode and had windows preinstalled in UEFI mode. Now I am not able to get the boot screen to select Windows or Ubuntu option. I cannot uninstall Ubuntu or don’t know how to do it?

Kindly help me with it?

I’ve moved this to the https://community.ubuntu.com/c/support-help-requests category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the https://community.ubuntu.com/t/finding-help/712 page.