Conflict with boot order – Ask Ubuntu

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I wanted to boot ubuntu from usb. I was facing a problem of changing boot order from bios boot menu as after I changed and saved the order and rebooted the laptop, it would not boot according to the latest changes made by me. So I used efibootmgr to change boot order of current ubuntu installation and set it at last. But now, my ubuntu installation isn’t starting up. Every time I start my laptop, bios appears, even after I remove the usb. Please help. I don’t want my data to be lost.