Five-year support is provided for Ubuntu LTS distributions (both Ubuntu Desktop and Ubuntu Server). You can find version numbers that are higher than 18.04.2, but they may not offer long term support yet. Let’s download Ubuntu 18.04.2 LTS – this is the latest long term support (LTS) Ubuntu version available at this moment. Go to the official Ubuntu website and download the necessary version of the Ubuntu installer. You need to download the Ubuntu distribution for installing Ubuntu on VirtualBox. This point is especially important if you are looking for how to install Ubuntu 64-bit on VirtualBox. Your CPU (Central Processor Unit) must support Intel VT-x or AMD-v hardware virtualization features which must also be enabled in UEFI/BIOS.

In order to install Ubuntu on VirtualBox, you should have a physical computer with at least 4 GB of RAM (Random Access Memory), a hard disk drive with at least 30 GB of free space (SSD is preferred due to its higher performance).

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Ubuntu iso for virtualbox