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I'm having windows 10 and ubuntu 18.04 dual booted, when I try to boot to ubuntu then it directly opens windows 10, to overcome this I opened boot menu using F12 and then selected ubuntu from boot menu but still after selecting ubuntu it boots windows

To get into ubuntu I need a bootable USB each time and then from grub rescue I need to set root and prefix values each time, I also tried updating grub and another things mentioned in this, Can anyone suggest a solution for this so that I can get into Ubuntu easily without bootable USB.

PC details : Acer Nitro 5, EFI mode, GPT partition

Edit : I tried the suggested steps but issue is still unsolved

pbhadu21
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    You will need to reinstall grub so the linux bootloader ends up on your system disk instead of on the USB. – vanadium Dec 27 '19 at 16:27
  • Check https://askubuntu.com/questions/88384/how-can-i-repair-grub-how-to-get-ubuntu-back-after-installing-windows?noredirect=1&lq=1 – vanadium Dec 27 '19 at 16:27
  • Please boot into Windows, then click on he Windows START icon at bottom left. Hold down {SHIFT} and while holding it down, choose Shut Down. Then, power back up; are you able to choose Ubuntu and boot into Ubuntu? Please advise by clicking [edit] and tell us what happened. – K7AAY Dec 27 '19 at 17:25
  • @vanadium I tried reinstalling grub, but it didn't solve the issue. I can access to ubuntu and then I followed the steps you suggested to check and ran these commands sudo update-grub and then sudo grub-install /dev/sda but still the issue persists :| – pbhadu21 Dec 28 '19 at 17:22
  • @K7AAY I tried the steps you suggested but that is not working and still it directly opens Windows and also when I select ubuntu from boot menu then still it opens Windows – pbhadu21 Dec 28 '19 at 17:49

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