[Solved] My Ubuntu Linux VM will not start!

Discussions about using Linux guests in VirtualBox.
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

[Solved] My Ubuntu Linux VM will not start!

Post by andy1234 »

I run Virtualbox on Windows 10. I have a Linux 22.04 VM that I have not used for about 4 months. Now it won't start! It gets as far as the Ubuntu logo and then the screen goes black.

I have upgraded Virtualbox
Added a CPU
Reduced the RAM requested for the VM

No change!

Any idea how to go about further diagnosis?

Thanks!
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: My Ubuntu Linux VM will not start!

Post by mpack »

Please provide a VM log file. Make sure the VM is fully shut down, then right click it in the manager UI. Select "Show Log" and save "VBox.log" (no other file) to a zip file. Attach the zip here.
Airwave
Posts: 3
Joined: 3. May 2022, 11:39

Re: My Ubuntu Linux VM will not start!

Post by Airwave »

Same issue here.
Downgraded to 6.1.32 and its working again.
Unfortunately much slower than before upgrade and downgrade.
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: My Ubuntu Linux VM will not start!

Post by mpack »

Airwave wrote:Same issue here.
And yet I am not seeing a VM log attached to your post.

Slowness usually means that you have Hyper-v enabled on a Win10 or Win11 host.
Airwave
Posts: 3
Joined: 3. May 2022, 11:39

Re: My Ubuntu Linux VM will not start!

Post by Airwave »

Hi,

Hyper V is off...
Log attached, but this is after downgrade.

Thanks a lot.
Ubuntu_Work-2022-05-03-12-01-47.log
(119.25 KiB) Downloaded 16 times
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: My Ubuntu Linux VM will not start!

Post by mpack »

Airwave wrote: Hyper V is off...
Nope, Hyper-v is still on.
log wrote: 00:00:02.539449 HM: HMR3Init: Attempting fall back to NEM: AMD-V is not available
00:00:02.570598 NEM: info: Found optional import WinHvPlatform.dll!WHvQueryGpaRangeDirtyBitmap.
00:00:02.570661 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...
See HMR3Init: Attempting fall back to NEM (Hyper-V is active).
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

Re: My Ubuntu Linux VM will not start!

Post by andy1234 »

Mother of all log files deleted.
Last edited by andy1234 on 4. May 2022, 20:26, edited 1 time in total.
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

Re: My Ubuntu Linux VM will not start!

Post by andy1234 »

Part 2 of 3...

Mother of all log files deleted.
Last edited by andy1234 on 4. May 2022, 20:26, edited 1 time in total.
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

Re: My Ubuntu Linux VM will not start!

Post by andy1234 »

Part 2 of 3....
Mother of all log files deleted.
Last edited by andy1234 on 4. May 2022, 20:27, edited 1 time in total.
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: My Ubuntu Linux VM will not start!

Post by mpack »

Uh... I gave clear instructions to zip the log and attach the zip here. Please review the instructions again. It's only one line.
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

Re: My Ubuntu Linux VM will not start!

Post by andy1234 »

Here is the log as an attached zip file.
Attachments
Ubuntu 20.04-2022-05-04-10-00-22.zip
(29.83 KiB) Downloaded 6 times
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: My Ubuntu Linux VM will not start!

Post by mpack »

@andy1234: You have Hyper-v enabled.
00:00:05.002631 HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
00:00:05.079020 NEM: info: Found optional import WinHvPlatform.dll!WHvQueryGpaRangeDirtyBitmap.
00:00:05.079100 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...
See HMR3Init: Attempting fall back to NEM (Hyper-V is active).

Other than that, 7.9GB RAM is a bit much for your 16GB host. I would reduce to 6GB (6144MB). 2 CPU cores is perfect.

Graphics RAM is ridiculous at 16MB, increase this to 128MB. Then consider updating the Guest Additions and enabling 3D acceleration.
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

Re: My Ubuntu Linux VM will not start!

Post by andy1234 »

Thanks! I am OOT for a long weekkend but I will go into this and get back on Monday.

Chow!
andy1234
Posts: 15
Joined: 3. May 2022, 02:57

Re: My Ubuntu Linux VM will not start!

Post by andy1234 »

@mpack: You are a Hero of ex-Soviet Labor!

Turning off Hyper V worked!

I wonder who turned it on.

Once agin, many thanks.
Airwave
Posts: 3
Joined: 3. May 2022, 11:39

Re: My Ubuntu Linux VM will not start!

Post by Airwave »

@mpack: worked also for me.

So much thanks!!!!

HyperV obviously reactivated via MS Updates.

Great help
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