Installation Requirements
You will need a computer. Options include:

A Normal Computer: This is strongly recommended. Many installs use a VM in EC2. Phabricator installs properly and works well on a normal computer.
A Shared Host: This may work, but is not recommended. Many shared hosting environments have restrictions which prevent some of Phabricator's features from working. Consider using a normal computer instead.
A SAN Appliance, Network Router, Gaming Console, Raspberry Pi, etc.: Although you may be able to install Phabricator on specialized hardware, it is unlikely to work well and will be difficult for us to support. Strongly consider using a normal computer instead.
A Toaster, Car, Firearm, Thermostat, etc.: Yes, many modern devices now have embedded computing capability. We live in interesting times. However, you should not install Phabricator on these devices. Instead, install it on a normal computer.