Windows 10: Can’t boot into Windows 10 Installation Tool after uninstalling Ubuntu..then it gets stuck...

submitted by /u/Dehyy
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:)

 

Can't boot after dual-boot crash (Windows 10 and Ubuntu)

I have a problem with my Lenovo h500. I replaced the hard drive with a 1 TB WDC drive and upped the RAM to 8 GB.

The unit came with Windows 8, and I upgraded to Windows 10 and have installed every update up until May 2018.

Then I installed ubuntu 18.04 in a dual-boot configuration, keeping my Windows 10. A few days ago, while ubuntu was updating to a new version, my mouse ran out of power, and the machine suddenly switched off.

When I rebooted, I got a black screen with a message that lasted less than a second. By videoing the screen, I was able to get this:

Failed to open \EFI\BOOT\grubx64.efi – Not Found

Failed to load image \EFI\BOOT\grubx64.efi – Not Found

Start_image() returned Not Found

So, I can’t boot into windows or ubuntu, but I can get to a cmd prompt line using a Windows recovery DVD. My bios doesn’t help. It only gives me an option to start in UEFI or legacy mode. After failing with legacy, I’ve switched to UEFI permanently. But
the BIOS won’t let me scrounge around and delete references to ubuntu. And I can’t get to it through the command line on the Rescue Disk either.

So here are the things I’ve tried to fix this:

1. Ran the ubuntu Boot_repair program. Didn’t fix it.
2. Tried to replace the file in terminal. Didn’t fix it.
3. Re-installed ubuntu. Didn’t fix it. Just added another copy.
4. Removed the new installation of ubuntu. Didn’t fix it.
5. Deleted the partitions on which ubuntu resided. Created a new partition in that space. Didn’t fix it.
6. Tried to fix the FAT32 system partition through a number of different means, including:
   1. Using the bootrec /fixboot command. Response: Access is denied.
   2. Tried bootrec /rebuildbcd. Access denied.
   3. Tried to open the bcd with BCDedit. OS couldn’t find the “object.”
      
   4. Decided I needed full access to the System Disk. Assigned a drive letter to the system disk. Didn’t fix it. Access problem not fixed.
      
   5. Changed the gpt attributes of the file. Access problem not fixed..
   6. Tried the Set=id 07, and 17. Those commands, though suggested in many blogs, were not recognized by Recovery disk OS. Access problem not fixed.
      
   7. Using DISKPART, deleted the system partition. Created a new EFI partition. Didn’t fix it. SWith a brand new system drive, still can’t use the bootrec tools. Couldn’t unhide the partition I created. Still no access to bootrec tools.
      

If the problem is that the BIOS is still being told to look for the ubuntu starter, then the problem appears not reside in the system disk, which although still hidden doesn't have any references to the ubuntu files. My questions are:

Why can’t I use the bootrec tools?

On which partition is this screen message stored?

How can I access what the BIOS appears to accessing, namely, a file that is telling it to try to open ubuntu?

Why is there no ubuntu uninstall program?



Thanks

 

Dual boot Ubuntu with pre-installed Windows

Hi Andre,

I got around the above problem using cipher and defrag using cmd.

However, I've two questions:

1. Can I re-enable the Secure boot after I've installed Ubuntu?

2. If I want to uninstall Ubuntu later and get back to Windows being the only OS, what are the steps for that?

Thanks.

 

Windows 10 USB boot

Hi there, am not a windows 10 expert. I have a pc in the bedroom on windows 10, I messed up the bootloader trying to fix the xp on that system.

System wont boot, trying to repair via win 10 usb installer.

Downloaded the media creation tool to install windows 10 installer on usb stick. Not compatible with a host of usb sticks I have. Tried the usb sticks that others use, but I think they use rufus; as the media creation tool by win 10 does not detect the usb stick.

So quick question, the win10 machine i am trying to repair the bootloader is a win7 upgraded to win10.
If i were to use the usb win10 installer to "repair installation" does the version of the iso downloaded via the media creation tool matter?

There is three options:
Windows 10
Windows 10 Home
Windows 10 N

Also is there a step by step instead of using rufus as I want to try an alternative method of creating a usb win 10 installer. Preferably with more compatibility.

System is a asus sabertooth 990 (r2?) with AMD phenom X 6.

Also is there any other software I can load onto the usb that can repair the bootloader easily?
That would be the ideal alternative. Thanks