grub2 - Cannot boot Ubuntu unless I choose it in in BIOS boot menu after deleting windows partition and reinstalling - Ask Ubuntu


i using windows7 , ubuntu dual boot , things going fine until deleted partition of windows. after reboot system ubuntu didn't boot , grub rescue terminal showed up.

i used live usb flash drive , reinstalled ubuntu erasing on hard disk scratch, unable boot ubuntu automatically; every time need press f12 , choose ubuntu boot bios setup.

i have run boot-info script

when use gparted throwing error 

the backup gpt table corrupt, primary appears ok, used.


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