Falling back into guru meditation with virtualbox 6.1.12r1318 in Debian 10 system

[Tof]

Good morning everyone, I am new on this forum. Thank you for accepting me.

For many months, I was working without any problems in my debian 10 system with virtualbox 6.1.12r13181 to open a virtual machine Ubuntu 12.04.

I saved the vdi file of my Ubuntu 12.04 on a external usb hard drive from time to time.

I had no enough free spaces on my Debian partition.

So I have reduced another home partition Ubuntu 20.04 from the Debian 10 system with Gparted.

And I have moved the root / and home partition of my Debian system from the Ubuntu 20.04 with Gparted.

I restarted Debian without any problems and errors and I got 60go more free space.

Nevertheless, my Ubuntu 12.04 virtual machine now refuses to start from Virtualbox with an error of state of GURU MEDITATION.

I tried to restore my previous backup of vdi file but I have the same issue.

Has anybody got this king of problem an is there any solution ?

Or should I backup my virtual machine to generate a ova file that can be correctly restored ?*

I have joined the log file from Virtualbox.

Thanks in advance.

[scottgus1]

From the log:

00:00:04.771863 VMMDev: Guest Log: BIOS: Booting from Hard Disk...
00:00:04.772642 Changing the VM state from 'RUNNING' to 'GURU_MEDITATION'
00:00:04.772657 Console: Machine state changed to 'GuruMeditation'
00:00:04.773143 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
00:00:04.773145 !!
00:00:04.773146 !! VCPU0: Guru Meditation 1155 (VINF_EM_TRIPLE_FAULT)

Soon as the guest touches the disk file, it triple-faults. A triple-fault is a virtual throwing up of the hands in frustration because Virtualbox found so many errors there was nothing to do.

Exporting to an OVA will only export the damaged guest, not fix it. (If it exports at all.)

I saved the vdi file of my Ubuntu 12.04 on a external usb hard drive from time to time.

Was this done for a backup? If this is the case you should be able to copy the most recent .vdi back to where it was in the original location and get the state of the guest at that time. (provided you were not using snapshots or such differencing disks).

Otherwise the only thing I can think of is to restore the host PC's disk with a disk image. (computers do glitch sometimes, and the only data that is important is the data that has been restorably backed up.)

FWIW a true backup f a Virtualbox guest is a copy not only of the disk file but the whole guest folder and everything therein. The guest folder is where the "motherboard" and "peripherals" are.

[fth0]

vCPU 0 is still operating in real mode, and 52736 bytes have been read from the virtual hard disk. I'd therefore guess that the VM is executing the OS loader (e.g. GRUB) when the crash happens.

Besides problems with the disk content, there could also be a 32/64-bit problem. The guest is configured as a 32-bit system. Is the installed Ubuntu 12.04 32-bit or 64-bit?

[Tof]

Thanks to all of you for your answers !

Informations:
The pc is a laptop Inspiron 3793
The host os system is Debian 10 bullseye amd64
The guest os system is Ubuntu 12.05 x86

Joined file virtualbox.zip :
1) Directory /etc/apt of my laptop Inspiron 3793
2) Informations about the host system.
3) Log file of my laptop Inspiron 3793 which crashes in Virtualbox app (VBox.error.log).
4) Log file of another pc OptiPlex 380 which does not crash in Virtualbox app (VBox.ok.log)

Notes:
I have restored a previous ova file backup of my ubuntu 12.04 on the pc OptiPlex 380 , and virtualbox correctly runs.
I have restored the same previous ova file backup of my ubuntu 12.04 on laptop Inspiron 3793 , and virtualbox crashes.
I have installed a new virtual machine with the Ubuntu 12.04 on laptop Inspiron 3793. The installation was ok. But virtualbox crashes again when I try to start the new virtual machine. In the configuration of my new virtual machine, I disconnected USB, Serial ports, Sound, Network, Shared folder but it the same issue.

The previous release of virtualbox was not crashing on me laptop Inspiron 3793 until the end of july (/var/cache/apt/archives/virtualbox-6.1_6.1.8-137981~Debian~buster_amd64.deb and /var/cache/apt/archives/virtualbox-6.1_6.1.10-138449~Debian~buster_amd64.deb). In may and june , I had installed virtualbox from the repository of virtualbox and not from the debian package repositories. But after I had resized some partitions of my multiple systems pc, I noticed that virtualbox crashed, so I have uninstalled virtualbox and disconnected the visrtualbox repository in sources.list, and opened the sid repository to install the official virtualbox of Debian (/var/cache/apt/archives/virtualbox_6.1.12-dfsg-9_amd64.deb); But the problem goes on ...