virtualbox.org

After a reboot of the VM I have the Following screen
How to solve this problem ?
Best regards
AD34

We will need to see the VBox.log file from the guest in question. Boot the guest, make sure the problem occurs then shut the guest down (by force if necessary). zip the log file and attach it to the thread.

-Andy.

here is the requested file
Thanks for help

VBox.log wrote:

00:00:03.153859   NumCPUs           <integer> = 0x0000000000000010 (16)
00:00:04.320383 CPUM: Physical host cores: 20

I know you aren't short of physical cores but do you really need 16 of them in the guest?

VBox.log wrote:

00:00:02.966078 Host RAM: 130993MB (127.9GB) total, 123568MB (120.6GB) available
00:00:03.153864   RamSize           <integer> = 0x0000000100000000 (4 294 967 296, 4 096 MB, 4.0 GB)

Where you have been generous with CPU cores you have been stingy with RAM!

Neither of those are likely to account for your issue. This however...

VBox.log wrote:

00:00:03.154252   VMSVGA3dEnabled    <integer> = 0x0000000000000000 (0)
00:00:03.154252   VMSVGAEnabled      <integer> = 0x0000000000000001 (1)
00:00:03.154255   VRamSize           <integer> = 0x0000000002000000 (33 554 432, 32 MB)

This is using the new VMSVGA vGPU which is the default for new Linux guests. This has a few issues that the devs are looking into. With the guest shutdown try changing it to VBoxVGA and see if that improves the situation.

-Andy.

This is using the new VMSVGA vGPU which is the default for new Linux guests. This has a few issues that the devs are looking into. With the guest shutdown try changing it to VBoxVGA and see if that improves the situation.

No change
I also try in a second time, to change to 12 CPU and 8 Go of RAM, but it doesn't change anything
another idea ?

the virtual machine was in "pausing" mode, I waked it up and made an upgrade with sudo - apt upgrade, when I shutted it down and the restarted, I have had this problem (any link ?)
here is also the new log

00:00:03.062282 [/Devices/usb-ohci/] (level 2)

You could switch to xHCI (USB3), you already have the ExtPack installed and Ubuntu 18.04 supports it.

00:00:03.062299 3DEnabled   <integer> = 0x0000000000000000 (0)
00:00:03.062305 VRamSize    <integer> = 0x0000000002000000 (33 554 432, 32 MB)

You could enable 3D acceleration for better performance. Your VRAM seems awfully low. You should maximize the VRAM available to your guest, to 128 MB.

Other than that, there's nothing wrong with your VM. If that doesn't fix it (mainly the VRAM), you got to keep in mind that just because an OS/program that runs in the context of VirtualBox has a problem, it doesn't make it a VirtualBox problem necessarily. You may be having an issue that has most probably nothing to do with VirtualBox, so my suggestion would be to treat it as such, as a native problem with the OS of the guest.

Thank you for help
I think it's definitely a guest os problem (probably linked with paused VM, then update and reboot)
Best regards
Alain