Failed to unmount | Linux Mint Community🍵 | Page 1

hardy elbow Jul 1, 2024, 4:10 PM

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Hello all 👋

I get the following message someteimes when i shut down my pc.
Not every time. But sometimes. And if so the pc don't reacht to anything.
Then i have to hold the power switch for several seconds until it turns completely off.

I've searched it already and found some people suggest to uninstall old kernels or others say that the Nvidia driver is the problem.

I mean... The Nvidia driver i need. Because i have an Nvidia card. Old kernels i have installed because i switched to the newest 6.x
So i have two old from 5.x Don't know why two. But there are two of them installed.
Not sure what will happen if i uninstall the older kernels.

Can you help me what i can do?

hazy junco Jul 1, 2024, 4:20 PM

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that oldroot folder is probably from some chroot thing you did at some point. Use a root file manager to view your filesystem from the top folder (/) and see what's in oldroot or if it's even there.

hardy elbow Jul 1, 2024, 4:21 PM

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How do i do this?

hazy junco Jul 1, 2024, 4:24 PM

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sudo nemo

hardy elbow Jul 1, 2024, 4:29 PM

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I can't find any oldroot folder

hazy junco Jul 1, 2024, 4:29 PM

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ok.

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well that's a good start

hardy elbow Jul 1, 2024, 4:32 PM

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And now? What can i do?

hazy junco Jul 1, 2024, 4:34 PM

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🤷

hardy elbow Jul 1, 2024, 4:36 PM

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Ok. Maybe someone other has an idea.
Thank you!

silver heron Jul 1, 2024, 4:52 PM

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You can try sudo apt autoremove to get rid of orphaned packages. Other than that, lsof can be used to list open files (literally what the command means) for a given target, so you get an idea what is keeping it opened.

hardy elbow Jul 1, 2024, 4:56 PM

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I let run the first command and it uninstall some things.
The second command gives me a long list of things.

silver heron Jul 1, 2024, 4:58 PM

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You need to use lsof with a target. If unsure, read the manpage. https://www.man7.org/linux/man-pages/man8/lsof.8.html
In the absence of any options, lsof lists all open files belonging to all active processes.

hardy elbow Jul 1, 2024, 4:59 PM

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And which target i should take with lsof?
Sorry. I'm relatively new to Linux 😅

silver heron Jul 1, 2024, 5:39 PM

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I thought that was obvious: /oldroot

hardy elbow Jul 1, 2024, 5:51 PM

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silver heron Jul 1, 2024, 5:57 PM

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You will first have to figure out where it lives.

hazy junco Jul 1, 2024, 5:57 PM

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silver heron I thought that was obvious: `/oldroot`

it seems to not exist during a normal running session

silver heron Jul 1, 2024, 5:57 PM

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Might be virtual, like /proc

hazy junco Jul 1, 2024, 5:57 PM

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yet at shutdown, that first pic message appears

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brb

hardy elbow Jul 1, 2024, 5:59 PM

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I typed it in with /proc. No oldroot there.

silver heron Jul 1, 2024, 5:59 PM

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No, I was just giving an example for a virtual directory. The /proc one is literally the CPU registers and stuff.

hardy elbow Jul 1, 2024, 5:59 PM

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Is it possible that this only happens if i do something specific with my pc? Maybe a game or software that can sause this?

silver heron Jul 1, 2024, 6:00 PM

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I think, and I may be wrong here, that /oldroot is created during a kernel change or some other system operation. Which probably failed and did not clean up after itself.

hardy elbow Jul 1, 2024, 6:13 PM

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And what can i do to locate it and solve it? Do you have an idea?

hazy junco Jul 1, 2024, 6:14 PM

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is there an SD card plugged in?

hardy elbow Jul 1, 2024, 6:14 PM

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No

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Only when i connect one if i copy photos to my hdd.
But yesterday as i got this message i never connected an sd-card

hazy junco Jul 1, 2024, 6:15 PM

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and you say once in a while it lockup the system. how often out of every 10 shutdowns will it freeze?

hardy elbow Jul 1, 2024, 6:16 PM

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Yes. Or maybe less often. Most of the time it shut down normally.

hazy junco Jul 1, 2024, 6:17 PM

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check you Timeshift schedule.

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might have been Timeshift doing a backup at that moment you chose to shutdown

hardy elbow Jul 1, 2024, 6:17 PM

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What if i say i haven't activated timeshift 😅

hazy junco Jul 1, 2024, 6:17 PM

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oj

hardy elbow Jul 1, 2024, 6:17 PM

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oj?

hazy junco Jul 1, 2024, 6:18 PM

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nothing

hardy elbow Jul 1, 2024, 6:18 PM

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Should i activate it?

hazy junco Jul 1, 2024, 6:18 PM

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u can if u want to have a backup

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set for once a week perhaps

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the oldroot thing really sounds like some kind of change-root (chroot) operation is happening, which is why I presumed it may have been a Timeshift sync in progress

hardy elbow Jul 1, 2024, 6:22 PM

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Only thing i have found that i also have in my system are 2 kernels.
Now there is 5.15.0-113 & 6.5.0-41 installed.
But not sure what happens if i uninstall 5.15

hazy junco Jul 1, 2024, 6:47 PM

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u can keep 2 that is fine (for rollback purposes)

silver heron Jul 1, 2024, 6:51 PM

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hazy junco u can if u want to have a backup

We interrupt this support ticket to tell you that Timeshift makes snapshots only, and a snapshot is not a backup. Do make backups unless your data is not important to you.
Sorry, that one triggered me.

hazy junco Jul 1, 2024, 6:54 PM

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true. I meant it as system backup

hazy junco Jul 3, 2024, 10:55 PM

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hardy elbow Only thing i have found that i also have in my system are 2 kernels. Now there i...

Hello. did you resolve this issue?i

hardy elbow Jul 4, 2024, 2:29 AM

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hazy junco Hello. did you resolve this issue?i

Until now the PC shuts down normally. But ktmcan be this way forma week and then come back. I had the problem before also not every day.

I will tell you in a while if it's gone or not. Hopefully it's gone now 👍

hardy elbow Jul 7, 2024, 7:32 AM

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It's not away. Yesterday i had this problem again 😦

hardy elbow Jul 9, 2024, 9:57 AM

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And yesterday again...

Maybe i should reinstall Linux Mint.
But i don't have the effort now for this 🙈

#Failed to unmount