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First of all, if you're going to use VirtualBox with Ubuntu, and either dual-boot, or even if Ubuntu is the only thing on your machine, you will probably need to deal with EUFI Secure Boot. For example, if you have a Hewlett Packard system, you'll find instructions [https://support.hp.com/in-en/document/c04784866 here] for enabling and disabling Secure Boot. (hint; hit <kbd>F10</kbd> at POST). While you're in your system setup (aka "BIOS" although it's not BIOS anymore) make sure you enable [[wp:X86_virtualization#Intel_virtualization_(VT-x)|VT-x]] / VT-d
* Assuming you disable secure boot due to a package installation, even when you re-enable secure boot in your system configuration, you may still see [https://askubuntu.com/questions/726052/ubuntu-booting-in-insecure-mode-with-secureboot-enabled “Booting in insecure mode” with SecureBoot enabled]
The packaged version of VirtualBox on Ubuntu 17.10 is older than the upstream (like normal) so you should just add the ppa for Oracle.