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I ran a Windows 10 on virtualbox for an hour allowing half my ram and my cores. After closing it my host remained laggy, even when moving the mouse.
I tried rebooting and I got the famous kernel panic - attempted to kill init message.
Since, my computer is still laggy even if I don't started the VM again, when I shutdown the computer it closes normally, when I try to reboot I get the same kernel panic.
I wanted to run a memtest86+ but I didn't managed to get it installed on a key.

I have Linux 5.3.0-45 with ubuntu mint 18.04.1
EDIT After more time experimenting with an the previous kernel version, I have the lag on the system starting a few minutes after booting and the kernel panic occurs randomly on reboot or shutdown.

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  • Can you help me with a picture and boot from the LiveUSB and grab a copy of kern.log in /var/log ?
    – kortewegdevries
    Apr 25, 2020 at 8:43
  • While waiting for answers I tried with the kernel 5.3.0-42 and it seems to have resolved the problem even after rebooting to 5.3.0-45. If think kern.log only stores the last boot session so I won't be able to provide you details on the problem. I'm still worried on how this could happend but I think I'm safe as long as I don't start the VM.
    – Nonoreve
    Apr 25, 2020 at 9:27
  • I'll just wait some hours to be sure it is really solved before closing the question
    – Nonoreve
    Apr 25, 2020 at 9:30

1 Answer 1

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The problem was caused by Timeshift he was trying to copy the 50Go virtualDisk file in a location with not enough space. I had to kill it to access its gui and disable daily saves.

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