Here is How to Uninstall Virtualbox from Ubuntu Completely with the step by step instructions provided below. So there are many ways to remove Virtualbox from your linux computer but the best ways are provided below.
How To Uninstall Virtualbox from Ubuntu?
To check if the virtualbox is already installed then check the version of the Virtualbox with the following commands:
sudo apt install aptitude aptitude search virtualbox\*
If the latest version
virtualbox-5.1. is installed in your computer then check the version by
dpkg-query -s virtualbox-5.1
To remove it completely use this command
sudo apt remove VirtualBox-5.1
Another Method to uninstall Virtualbox from Ubuntu
The problem is Virtual Box keeps its folder and settings in your home folder. You you have to delete everything inside the folder.
First uninstall VirtualBox
sudo apt-get remove --purge virtualbox
Run these commands to delete all virtual machines and settings and Virtual Hard Drives:
sudo rm ~/"VirtualBox VMs" -Rf sudo rm ~/.config/VirtualBox/ -Rf
Run this command If you want to install it again
sudo apt-get install virtualbox
sudo ps aux | grep -i "vbox"
Kill any “ghost” processes you may think are relevant.
sudo pkill VBox*