Dualboot won't boot. Tried boot repair

Support and Help
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Ubuntu Version:
I am not sure and can’t seem to find it due to it not booting but i think it is the latest or one update back of GUI version of ubuntu →

Desktop Environment (if applicable):
No idea what this means →

Problem Description:
when rebooting the bios started “disk repair”. Afterwards linux booted in the grub terminal. I googled and got bootrepair on a thumb frive an ran that.
The paste bin: Ubuntu Pastebin

Bootrepair does not give me a “recommended repair” option . i only habe the “create boot info summary” option. (see screenshot)

Relevant System Information:
It’s a win 10 en linux ubuntu dual boot install. Had no problem until today.

Screenshots or Error Messages:

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Screenshot from 2025-10-04 09-05-37
seems like my screenshot did not upload so here it is

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The only OS I see mentioned in your paste is

Linux Mint 21.2, victoria, x86_64

If you refer to the Support and Help rules you’ll note

Linux Mint is an OS based on Ubuntu, and supported by the Linux Mint team.

FYI: I’d start by checking the health of your sdb disk/device, then check for partition/logical problems if it’s actually healthy. I only scanned briefly though, as details in your paste show nothing I saw as on-topic here

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Wait what?? I definitly installed and used regular ubuntu.

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Hold on, It is just not there?? I defenetly installed it!!

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We’re limited to details you provide, which included a link to a paste made by a Ubuntu based OS (open it and search yourself for the string I provided; you’ll see it there), mention of a windows recovery environment (for an unknown version; it reports 10 or 11) and problems with device sdb.

No Ubuntu detail was provided in that link, only a Ubuntu based reference to Linux Mint which is your live OS. (Linux Mint being Ubuntu based, does include some files that contain the word Ubuntu; but that still doesn’t make it Ubuntu).

We don’t support Linux Mint.

The problems with device sdb mean little detail can be obtained from that device; why I suggest you start by checking the health of the device (SMART) etc; though checking for hardware issues is also something I do on any unexpected problem.

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okay so how would I run a SMART check onn the drive?

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@driesbe

Hi and welcome to Ubuntu Discourse :slight_smile:

I am sure this must be frustrating for you to discover that something you thought was installed now appears to have disappeared.

Right now, we have limited information so I need to ask some questions to try and help you figure this out.

  1. was there a major update/upgrade to either Windows or the Linux install recently?
  2. did you experience any power outages/surges that might have caused this?

As things stand, you only have Windows installed, can you boot into it cleanly?

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Ooooooh i figured out what i did different…

I have this quick-slot on the front of my pc to install a temporary HDD.
I took the drive i forgot in there out… and it turns out it needs to be there when i wanna boot Linux. Even though i am pretty sure it isn’t the drive I have linux installed on (it appears mostly empty when i open it in a file browser)

I must have been in there when my IT friend installed Ubuntu on this PC…

Sorry for bothering everyone. I feel so silly!!

1 Like
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You can boot both Windows and Linux without issue now?

Certainly hope so :pray:

No need to feel silly, sometimes we all miss the obvious things when trying to figure it out.

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It looks like it all works fine now!

1 Like
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Just for info, it looks like Boot-Repair has switched from using Lubuntu to using Mint.
So you may see a Mint in a Boot-Repair report, but it is just its live installer.

I normally suggest users use the live installer from whatever verison they are installing and use the Boot-Repair ppa to add Boot-Repair to their live installer. Instructions on ppa are on the Boot-Repair page as second option.

1 Like