Wednesday, July 4, 2018

grub - Windows & Linux [UEFI triple boot issues]




So I installed my OSes, three in total, in UEFI successfully. At least, I think so. They boot and work. The problem is, the grub menu no longer functions the way that it did on Legacy BIOS mode.



Before I was presented a purple menu where I could scroll down to select Ubuntu, Windows 7 or Windows 10 + a folder to select other Ubuntu options. It would boot immediately into whatever I selected.



Now though, I'm presented with a grub menu that looks the same but doesn't function the same. Instead of other options (besides Ubuntu at least), I have a whole bunch of weird options like Windows Bootloader and Windows boot.efi etc.



If I click into any of the Windows related options, it will take me to Windows 10's blue screen to select Windows 10 or 7. Now here's the problem. It doesn't immediately go into the OS I selected it takes me back to the purple menu screen via a reboot and I have to select any of the Windows options again for it to load into whatever Windows OS that I picked.



So, what could be the problem here? I tried boot-repair and followed its instructions, but the problem persists.




The steps I took for my triple boot UEFI installs was this: Change BIOS to UEFI > create Windows USB devices with Rufus GPT support > install Windows 7 > install Windows 10 > install Ubuntu 16.04 > Boot-Repair > Change in BIOS to boot off the Ubuntu drive as BR suggested (thought it said to boot off of bootXX.efi sdX). All OSes are installed on their own HDDs, by the way.



Is there any way to fix this problem? Did I do something wrong? I've been trying to figure this out for two days now and it has been hopeless.



edit



I can get some screenshots if it'll help.


Answer



I found a solution to the problem. I didn't want to revert to BIOS/Legacy, as I wanted the UEFI benefits, so I was determined and googled various minor solutions that led me to my overall solution. I posted the full steps on the ubuntu forums.




https://ubuntuforums.org/showthread.php?t=2384848&p=13739574#post13739574



Hopefully this will help people! :)


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