I have a new HP laptop. I have deployed windows 8.1 & ubuntu 15.  Recently I removed ubuntu 15 and deployed ubuntu 10.04.  Installation have been completed successfully.  But after restarting the system I can not boot either windows or ubuntu.  It is showing GNU GRUB version 2.02~beta2-29Minimal BASH-l ine.......   Kindly help.
unable to boot windows after installing ubuntu 10.04
ubuntu