Dual Boot Problem, Ubuntu 14.04 fine, but tries to boot Win 7, instead of 10

Hi,

I installed Ubuntu 14.04 on a Toshiba Satellite L550D which came installed with Windows 7 and was upgraded to Windows 10.

The Ubuntu works fine, in fact, it is dazzling compared to the Windows 10. But the dual boot failed to recognize Windows 10, instead identified Windows 7 as the installed version of Windows and tries to boot Windows 7. As such the Windows boot fails.

Much thanks for all help,

Newbie Mike

PS Not quite Newbie as this is my second Linux installation.