virtual box
Linux Ubuntu

[Solved] kernel error scrolling VMMDev: Guest Log: vbg_status_code_to_errno: Unhandled err -78

I  noticed that there is a kernel error scrolling VMMDev: Guest Log: vbg_status_code_to_errno: Unhandled err -78 every 4 seconds. I noticed it started happening right when I started playing with the Shared Folders options on the VM VirtualBox Manager… But it didn’t stop when I set things back to their original state, so it just may have been timing.

That message seemed to be kernel related, so I contemplated reinstalling the kernel…. which currently is linux-headers-5.8.0-36-generic The current files in my /usr/src are:

drwxr-xr-x 24 root root 4096 Jan  5 13:54 linux-headers-5.4.0-59/
drwxr-xr-x  7 root root 4096 Jan  5 13:54 linux-headers-5.4.0-59-generic/
drwxr-xr-x 24 root root 4096 Jan  7 06:51 linux-hwe-5.8-headers-5.8.0-34/
drwxr-xr-x  7 root root 4096 Jan  7 06:51 linux-headers-5.8.0-34-generic/
drwxr-xr-x 24 root root 4096 Jan 10 06:07 linux-hwe-5.8-headers-5.8.0-36/
drwxr-xr-x  8 root root 4096 Jan 10 06:07 ./
drwxr-xr-x  7 root root 4096 Jan 10 06:07 linux-headers-5.8.0-36-generic/

Instead of reinstalling, I rebooted into 5.8.0-34-generic…. The problem exists there too.

So I went back to 5.4.0-59-generic and the problem is NOT there.

The problem is NOT on my MATE guest either. That guest is currently on 5.4.0-60-generic.

According to last reboot, unless someone sees something different, it seems the problem didn’t start until i came back into the newest kernel???

reboot   system boot  5.4.0-59-generic Sun Jan 10 19:29   still running
reboot   system boot  5.8.0-34-generic Sun Jan 10 19:27 - 19:29  (00:02)
reboot   system boot  5.8.0-36-generic Sun Jan 10 19:26 - 19:26  (00:00)
reboot   system boot  5.8.0-36-generic Sun Jan 10 18:42 - 19:25  (00:43)
reboot   system boot  5.8.0-36-generic Sun Jan 10 17:42 - 18:42  (00:59)
reboot   system boot  5.8.0-36-generic Sun Jan 10 13:34 - 17:41  (04:07)
reboot   system boot  5.8.0-36-generic Sun Jan 10 12:42 - 17:39  (04:57)
reboot   system boot  5.4.0-59-generic Tue Jan  5 10:05 - 17:39 (5+07:33)
reboot   system boot  5.4.0-58-generic Mon Jan  4 12:15 - 14:11 (1+01:56)
reboot   system boot  5.4.0-58-generic Mon Jan  4 00:32 - 16:16  (15:43)

So I tried the solution but I fond this one.

kernel error scrolling VMMDev: Guest Log: vbg_status_code_to_errno: Unhandled err -78 solutions:

When upgrading Virtualbox from version 6.1.10 to 6.1.16 make sure to also go into your VMs and load up the Guest Additions CD through Devices -> Insert Guest Additions CD

Then in a terminal window in your guest run:

sudo apt install build-essential

Mainly running the above line to make sure all build apps are installed, like gcc, make, etc.

Then install the Guest Additions to help with folder sharing, shared clipboard, drag and drop, etc.

sudo /media/$USER/VBox_GAs_6.1.16/VBoxLinuxAdditions.run

This is how you can solved the error related to kernel. I hope you find the solution regarding VB.

Please comment below if you have any opinion.

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