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.