If you have VT-x enabled on your BIOS, but this option is grayed out on Virtualbox interface, you can do the following to fix:
You may need to locate to the bin folder of virtualbox, if you’re on Windows, the following command should work.
VBoxManage modifyvm vm-name --nested-hw-virt on # On windows VBoxManage.exe modifyvm vm-name --nested-hw-virt on
Please change vm-name to your VirtualBox machine name
sudo apt-get autoremove virtualbox-dkms sudo apt-get install build-essential linux-headers-`uname -r` dkms virtualbox-dkms sudo modprobe vboxdrv sudo modprobe vboxnetflt
Install and use vagrant
sudo apt update sudo apt install curl curl -O https://releases.hashicorp.com/vagrant/2.2.10/vagrant_2.2.10_x86_64.deb sudo apt install ./vagrant_2.2.10_x86_64.deb ## Let's test vagrant --version mkdir vagrant-project cd vagrant-project vagrant init centos/8 ## If you already have a vagrant image.box vagrant box add mybox ./image.box vagrant init mybox vagrant up ## To ssh into vagrant box vagrant ssh ## To stop vagrant box vagrant halt ## To destroy and clean up everything vagrant destroy