With Windows 7, installed, I had successful installation completion of Ubuntu 15.04 expecting to have dual boot.
But upon installation completion, once I restarted the machine, it directs boots up into Windows and made me sad to see that I have lost a fair amount of my hard allocated for Ubuntu (obviously :))
The quick fix to solve the issue was to
1. Boot up Ubuntu 15.04 in live USB.
2. Install and Run Boot-Repair
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair
Once Boot-Repair is installed, run it from the terminal as ‘boot-repair’ (again obviously!) (All details on Boot-repair)
The process is self explanatory once you run boot-repair, and easy to follow.
3. Now I could successfully login to Ubuntu , through grub , but Windows option was not available. The fix was to
1. Login to Ubuntu
2. Run sudo update-grub
With earlier version of Ubuntu , I found it quite convenient and easy to install in dual boot mode. But with the later versions , it gives some trouble which is fun but well troubling………..