17 votes

How can I repair grub? (How to get Ubuntu back after installing Windows?)

On EFI-based systems (such as most systems that shipped with Windows 8 or later), Windows will sometimes update its boot loader or reset it to be the default boot loader. This is particularly common ...
Rod Smith's user avatar
  • 44.1k
17 votes
Accepted

Error on Ubuntu boot up - "recovering journal"

Let's first check your file system for errors. To check the file system on your Ubuntu partition: Boot to the GRUB menu. Choose Advanced Options. Choose Recovery mode. Choose Root access. At the # ...
heynnema's user avatar
  • 70.4k
13 votes
Accepted

Why is "boot-repair" listed twice in the ubuntu documentation?

The last line contains two commands. The first part installs boot-repair. (sudo apt-get install -y boot-repair) The "&&" characters is a delimiter like ";" is, however its conditional on ...
guiverc's user avatar
  • 30k
10 votes

Grub and Ubuntu disappeared after Windows update

If you're on your Windows, search for 'Command Prompt' and run as administrator. Then, in the command line, type: bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi Then, restart and you're good to ...
Huang Kevin's user avatar
8 votes

Dual boot with Windows 10 broken after update

I see this question was asked a couple of years ago. Since it comes up fairly high in the search results, I'll put in a late answer anyway. I have a dual-boot Windows/Ubuntu machine that I've been ...
Brad Richards's user avatar
7 votes
Accepted

Unable to boot newly installed Ubuntu 16.04 using UEFI mode?

Finally, I got it to boot in UEFI. The problem is with UEFI firmware which seems buggy. It does require the EFI partition to be the first one in the GPT table. The partition entries in GPT table were ...
user.dz's user avatar
  • 47.8k
7 votes

Cant enable gdm3 after following a tutorial on how to remove KDE from ubuntu

I faced similar type of problem. This is happened because of missing the Install in your gdm3.service file. To solve this, firstly you have to go /lib/systemd/system/ directory and then open the gdm3....
Md. Jamil Ahsan's user avatar
6 votes

How do I get my HP laptop to boot into grub from my new efi file?

I spent a day for the same problem and I finally solved it. The following is the exact solution. The full article for solving the problem is here Which is written by Rod Smith. Useful information ...
Tekin's user avatar
  • 161
6 votes

"GPT detected. Please create a BIOS-Boot partition" while using boot-repair

You can handle this issue as follows: Start Gparted. Identify the boot partition. Mine is the first 16.00MiB on my system disk. Delete the partition (you will not want to delete the wrong partition ...
yang's user avatar
  • 161
6 votes
Accepted

Can I remove Windows Boot Manager from dedicated Ubuntu computer?

It is normal to have two ubuntu entries. One is shim and the other grub. You can see the details of each with : sudo efibootmgr -v You can delete the /EFI/Microsoft folder in the ESP - efi system ...
oldfred's user avatar
  • 12k
6 votes

dual boot problem after using os-uninstaller

You have an UEFI system and UEFI install, but somehow converted the ESP - efi system partition sda2 from FAT32 to NTFS. It must be FAT32 with boot flag to be seen as ESP. And now all references to ...
oldfred's user avatar
  • 12k
6 votes

Getting grub menu to work on dual boot Ubuntu 22.04 Windows 11. Currently boots in a loop

Ubuntu 22.04 comes with Grub 2.06 and on this version, the OS Prober is set to 'disable' by default which means you won't find the other OSes such as Windows on the Grub prompt as before. So here's a ...
Nipuna's user avatar
  • 83
5 votes
Accepted

How to disable hibernation and fastboot from windows so dual boot works in Ubuntu 14.04

Boot into Windows, disable hibernation and Fast Boot. Open command prompt as administrator and execute: powercfg /h off Open the "old" version of Windows Control Panel. Go to the Power Settings ...
cl-netbox's user avatar
  • 31.1k
5 votes

How can I repair grub? (How to get Ubuntu back after installing Windows?)

It turns out grub can be fixed from Windows too. Running the following (as administrator) from CMD brought the grub menu back for me. bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi
mindlessgreen's user avatar
5 votes

How can I repair grub? (How to get Ubuntu back after installing Windows?)

Answers given by Scott and Web-E are good enough and have helped a lot many times. But many a times, the boot-repair tool is not able to repair grub due to problems related to i386 and amd64 platform ...
subtleseeker's user avatar
5 votes
Accepted

Ubuntu 16.04 won't boot when installed after Windows 10

I have finally managed to get into GRUB and boot to Ubuntu (Windows 10 works too!). Basically, I have followed this video (the part interesting for me starts about 5:50). In case of video take down, ...
Iguana Bob's user avatar
5 votes
Accepted

Problem with dual boot Win 10 | boot-repair unsuccessful

I had a similar issue. My EFI partition had a hidden flag, for some reason. After removing that flag (using GParted) boot-repair worked.
Oskar's user avatar
  • 66
5 votes
Accepted

Will OS-Uninstaller delete my data?

OS-Uninstaller does not uninstall any other operating systems except for the OS that is selected to be uninstalled, but if you choose to uninstall an OS it will remove everything on that partition ...
karel's user avatar
  • 113k
4 votes

How can I repair grub? (How to get Ubuntu back after installing Windows?)

Scott Severance's answer is valid and detailed but there is a resolution that requires no external boot device and so no need to identify and manually mount all of your Ubuntu partitions leading up to ...
timbo's user avatar
  • 323
4 votes

Why isn't boot-repair in the official Ubuntu repositories?

According to a Launchpad bug page, it needs a sponsor to upload it to the Ubuntu and Debian repositories. I read down the thread a bit and, while its rather old, it seems the developer still has no ...
TheWanderer's user avatar
  • 19.4k
4 votes
Accepted

Wubi installed Ubuntu 12.04 is not booting suddenly and showing GRUB prompt instead

If You have a 12.04 Live CD or bootable USB, Boot using that to Live Mode. Then mount your 'root.disc' and 'oldroot.disc' files in two folders in Live users home folder. (I'm assuming your two files ...
Anwar's user avatar
  • 76.5k
4 votes

How to repair Grub if yannubuntu doesn't exist?

In my case i forgot to connect to the internet. After connecting to the wifi it worked.
mahfuj asif's user avatar
4 votes
Accepted

Grub and Ubuntu disappeared after Windows update

Windows 10 Anniversary Update, and I understand that Windows 10 Creators Update is the same, both can delete Linux partitions for no particular reason. It's not fully understood what factors trigger ...
heynnema's user avatar
  • 70.4k
3 votes

Unable to install boot-repair

wilmc's answer didn't work for me, but it was on the right track which helped me find the answer. This is what I did to get this to work. First, type in these commands: cd /etc/apt/sources.list.d ...
amihart's user avatar
  • 31
3 votes

Dual boot Win 8 / Ubuntu loads only Win

The answer above didn't work for my friend's HP Pavilion, but I found a decent workaround. It seems that HP's firmware always overwrites the BootOrder on every boot and sets Windows first, but it ...
Leif Arne Storset's user avatar
3 votes

How do I get my HP laptop to boot into grub from my new efi file?

On my HP laptop I did as follows, step by step: 1 - Boot into ubuntu with F9 2 - Check where Windows boot loader is located sudo efibootmgr -v In my case /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi ...
Vitor Abella's user avatar
  • 7,457
3 votes
Accepted

Boot-Repair gets a kernel-panic while scanning the system

This is a known bug with older versions of the kernel, caused by the driver for the Realtek RTL8821AE WiFi card. Unfortunately, the ISO file which you can download from Sourceforge uses a kernel which ...
Matthew Cline's user avatar
3 votes
Accepted

boot repair disk not loading - boots into black screen

NVIDIA GEFORCE GTX 970 is a quite new graphics adapter, which often has compatibility issues with the open source nouveau drivers. Boot from the USB drive - once the GRUB menu appears, press the E key ...
cl-netbox's user avatar
  • 31.1k
3 votes
Accepted

Transfer Ubuntu to new, smaller disk with different partition number

So I took the plunge since nobody answered and decided to give it a shot, and it worked, in the end. Here's what I did; I plugged my new SSD in via USB. Opened gparted and went to my 1TB, right-...
Delorean's user avatar
  • 10.9k
3 votes

Wubi installed Ubuntu 12.04 is not booting suddenly and showing GRUB prompt instead

I was able to fix my problem. I have adopted half of the trick suggested by Anwar and rest I tried with my own as given below. Hope it can help others. I don't know technically correct it is, but it ...
jax's user avatar
  • 252

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