VM not starting (Ubuntu) - Critical error at startup

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Hello,

I have a team, all working on Windows 10 Enterprise and using the same Ubuntu image to mount in VirtualBox.
I am the only one to have crashs, from time to time, which leads me to mount again the old working Ubuntu image (impossible to restart the VM)
The crash translated says "a critical error has appeared while executing the virtual machine and it has been stopped". It occurs at the very beginning of the start of Ubuntu.
After shutdowning VirtualBox (properly or after a freeze), the crash can appear, or not…

You can find attached the logs.
Thanks
Cédric