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Installing SparkyLinux inside the VirtualBox with Efi Mode, the installed system can be not able to boot.
In most cases the VirtualBox will launch the EFI Shell.
To manually launch Sparky 64 bit version, run:
fs0:\EFI\sparky\grubx64.efi
If you used automatically partitioning, the efi file has been installed on /dev/sda1 partition. If you set other partition for efi file, change the partition number.
If you have launched Sparky manually, fix the startup as following:
sudo mount /dev/sda1 /mnt cd /mnt sudo echo '\EFI\sparky\grubx64.efi' > startup.nsh
Then reboot:
reboot