See this page for more details on how to install VirtualBox:
https://www.virtualbox.org/wiki/Downloads/
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Check if any update:
$ sudo apt update
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Install VirtualBox:
$ sudo apt install virtualbox virtualbox-ext-pack
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Check VirtualBox packages:
$ apt list --installed | grep virtualbox
virtualbox/bionic-updates,now 5.2.42-dfsg-0~ubuntu1.18.04.1 amd64 [installed]
virtualbox-dkms/bionic-updates,now 5.2.42-dfsg-0~ubuntu1.18.04.1 all [installed,automatic]
virtualbox-ext-pack/bionic-updates,now 5.2.42-1~ubuntu1.18.04.1 all [installed]
virtualbox-guest-dkms/bionic-updates,now 5.2.42-dfsg-0~ubuntu1.18.04.1 all [installed]
virtualbox-guest-utils/bionic-updates,now 5.2.42-dfsg-0~ubuntu1.18.04.1 amd64 [installed]
virtualbox-guest-x11/bionic-updates,now 5.2.42-dfsg-0~ubuntu1.18.04.1 amd64 [installed]
virtualbox-qt/bionic-updates,now 5.2.42-dfsg-0~ubuntu1.18.04.1 amd64 [installed,automatic]