I dual boot my machine by shrinking the size of partition and creating un-allocated space through windows 7 and at that un-allocated space I installed ubuntu after the complete installation of Ubuntu 18.04 I restart my laptop than the GRUB boot menu showed up. But there was only option for booting Ubuntu not the windows7.
Although all windows partitions can be accessed through ubuntu but at the starting no option is showing for booting window in the GRUB boot menu. I tried to rectify this error by using command:
But that did not work well. I run the following command as well:
sudo fdisk -l
the result is shown in which all the partitions are available
So, kindly provide me with the solution of that problem.