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I have installed virtualbox from terminal sudo apt-get install virtualbox Virtualbox asks for a password while installing. After restarting, computer says:

Failed to open /EFI/BOOT/mm64.efi : NOT FOUND

Failed to load image /EFI/BOOT/mm64.efi : NOT FOUND

Failed to start MokManager : NOT FOUND

Something has gone seriously wrong: Import_mok_state() failed : NOT FOUND

And after some seconds the laptop turns off again. I tried pressing Left Shift while system starts nothing happened. Cannot access boot directory to boot from usb. System does not boot from bootable usb. Greatly appreciate help, thanks.

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mysticAngel
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    Does this answer your question? [Can't install Ubuntu 18.10 on XPS 15 - EFI\BOOT\mmx64.efi not found](https://askubuntu.com/questions/1085550/cant-install-ubuntu-18-10-on-xps-15-efi-boot-mmx64-efi-not-found) – Kulfy Apr 21 '20 at 16:56

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Hit Assist key on Sony Vaiothen press start button. press F2 to open menu.

mysticAngel
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    The question is about a virtual machine. – guntbert Apr 21 '20 at 18:50
  • @guntbert I don't think the question was about Virtual Machine. In my interpretation, the issue occurred after OP installed *VirtualBox in Ubuntu* not *Ubuntu in VirtualBox* since they said ***And after some seconds the laptop turns off again***. – Kulfy Apr 22 '20 at 08:02
  • @mysicAngel Is your issue solved? Can you please elaborate what you did after opening the menu? – Kulfy Apr 22 '20 at 08:02