Unable to start a Linux VM in VirtualBox with a "Kernel driver not installed (rc=-1908)" error on macOS even if VirtualBox is reinstalled

MACOS Catalina 2020

Run following command and to clear vmBox

sudo kextcache --clear-staging

after that reinstall virtualBox and go to your Preferences --> security & privacy -->select General

you will see a allow option there you have to allow that .

NOTE:- that allow option will be there only for 30 min after you installed VMBox, otherwise you have to do install again.

Basically it is because Apple has blocked some extensions from loading. After unblocking them I can reinstall VB as expected.