Windows 10: Flash screen no longer shows up at boot. Goes straight to Ubuntu.

Windows doesn't work anymore. Also, my computer's flash screen doesn't even show.Can Microsoft please make their OS not total **** ****?Also what would you recommend I do, given that Chat Support don't seem to be "around", if you know what I mean.-Mike

:)

 

uefi boot not showing ubuntu / GRUB

I've an acer aspire e 14.

It has a single HDD with 7 partitions:

• EFI system on /dev/sda1
  
• Something described as "Microsoft Reserved" on /dev/sda2
  
• Windows 10 FS on /dev/sda3
  
• Linux FS on /dev/sda5
  
• Swap on /dev/sda6
  
• Microsoft Windows Recovery Manager on /dev/sda4
  
• Free Space on /dev/sda
  

Now the thing is, I'm sure both windows 10 and linux (lubuntu) are installed on UEFI mode, however there's no entry in the boot order to let me select ubuntu or grub as the prefered boot option.

If I don't do anything at boot it will automatically boot to windows 10 without asking anything.

If I want to boot to ubuntu I have to do the following trick:

1. Insert a bootable USB stick (with grub)
   
2. Once the computer boots, the grub of usb stick lets me choose between trying the live version of the OS in the USB or installing it, I just press Escape.
   
3. This brings up a console into which I just type 'exit'.
   
4. The following screen seems to be the UEFI boot selection, and it lets me choose between booting the USB, an 'unknown device', or windows 10 boot manager. If I choose the USB it just goes back to the screen on step 2. If I choose the last it boots windows 10, and if I choose the 'unknown device' it finally shows the screen of grub that's installed in the computer which lets me choose to boot lubuntu or windows.
   

I really have no idea as to how to solve this issue, so any suggestion or advice is welcome.

(Edit) Among the things I tried are the following:

• "efibootmgr -v" shows up two entries for the same file (an \EFI\ubuntu\shimx64.efi) one named ubuntu, and the other "unkwnown device" this last one also finish the description with an RC. I tried to change the --bootorder to match both of them before the windows boot manager, to no efect, at restarting I boot to windows, and when going back to linux the boot order is not the one I placed before.
  
• I tried redbuilding the grub as suggested by SmallLoanOf1M, to the same result, but I noticed a weird thing, my linux has a /boot/efi folder. But when I mounted the EFI system (/dev/sda1) to rebuild grub, what I got was that there is an "EFI" folder (notice the caps), could that be the problem? and if so, how should I solve this without messing up anything?
  

 

Help with dual booting Win 10 and Ubuntu

This is your whole problem. What you should have done is to put GRUB in sdb1 and Windows Manager in sda1 so that Windows Boot Manager is in control.
So what suggested above will not make any difference. GRUB is still in control of booting process.
To fix your problem. You will need to:

1. Move GRUB from sdb to sdb1
   |grub2 - how to move grub boot from one partition to another in linux - Ask Ubuntu
2. Rebuild The Windows Boot Manager ie. create a brand new BCD to boot Windows 10.
3. Once done with steps 1 and 2 above. Windows will not know UBUNTU exists and vice versa.
   Depend on the priority set in the BIOS, it will boot directly into that OS.
   However, you can boot either one from Boot Menu (Using whatever key that your Laptop assigned to: F2, F10....)
   Since I hate Dual Boot and seldom boot into Linux, I will stop here.
   Now, go to step 4 to create dual boot.
4. Use Easy BCD to create an entry for dual boot with UBUNTU. Once done, you should get a nice GUI dual Boot Menu
   and it will boot directly into either Windows or UBUNTU.

Here's the detailed explanation: How can I move windows 10 boot files to another drive to allow linux

 

Missing Bootable devices in BIOS after removing Ubuntu dual boot

Windows 10 Pro, Version 2004, OB build 19041.572

I have a Gigabyte GA-Z77X-UP4 TH mb. My BIOS has been set to UEFI for a while now and I had no issues with it. When I needed to boot into some live cd or flash drive, I would press F12 at boot and have a list of bootable devices to choose from. I also saw all of these devices in the BIOS, where I could choose them for a boot order.

I found myself using Ubuntu quite often with the “try ubuntu” option, so last week I decided to install it as a dual boot. I used a secondary hard drive for the Ubuntu partitions (not C.) After a few days, I decided to get rid of the dual boot. I went through all the steps to delete it; deleting the ubuntu partitions, and using diskpart to get GRUB removed from the boot loader. Although after this, the computer would boot right into Windows, for some reason, the ubuntu was still listed in bcdedit /enum firmware, so I also used bcdedit /delete to delete that.

Here’s the issue that I have now:

When I press F12 to boot into a live CD (or flash drive), the only boot option is Windows. In my BIOS, in the boot order section, I can only choose Windows; there is no more list of all my drives and CD ROM to choose to boot from.

The only way to get back the list of bootable devices is if I switch the “Boot Mode Selection” from “UFEI only” to anything else, like “UEFI and LEGACY” or “LEGACY only.”

However, if I switch to anything other than “UEFI only,” the computer won’t boot into windows; I get an error saying, “Reboot and select proper boot device.”

I am 99% sure that before I did the dual boot, I had “UEFI and LEGACY” selected in the BIOS and in Windows System information, it would show that my BIOS is UEFI.

What I need now is to be able to see a list of bootable devices in my BIOS, including my CD ROM, so that I can choose to boot from a CD or flash drive when desired, and of course, that my computer should boot into Windows when I just want to boot normally.

Notes:

1. Fast boot is disabled.
2. I read that Secure boot should be disabled but I don’t have that setting.
3. I read that CSM should be disabled but I don’t have that setting.
4. My C drive (SSD) is GPT, Active & System.

Any suggestions?