
Please also check our FAQ and if you find your question is answered there, PLEASE remove your post or at least change the flair to Solved. Please check Google and the VirtualBox Manual before asking simple questions. PLUS a detailed description of the problem, what research you have done, and the steps you have taken to fix it. Whether you have installed Guest Additions and/or Host Extensions (this solves 90% of the problems we see) Whether you have enabled VT-x/AMD-V (applicable to all hosts running 6.1 and above) and disabled HyperV (applicable to Windows 10 Hosts) Go to Security tab and look for “Select an UEFI file as trusted for executing” and click enter.This is just a friendly reminder in case you missed it.

In the boot settings, make sure that Secure Boot is turned on. Depending upon your manufacturer/model, you might need to use Del or F10 or F12 keys. You have to be very quick with it if you are using SSD hard disk because SSDs are very fast in booting. I had to press Fn+F2 (to press F2 key) on Acer Aspire R13 quickly.

Turn the power off and boot into boot settings. My OnePlus camera seems to be not very happy with my laptop screen. Fix no bootable device found error after installing Ubuntu

If you are in similar situation, you can try the fix which worked for me.
