In this tutorial, we will show you how to install and perform the first-time setup of Roundcube on Ubuntu 18.04. Install Roundcube Webmail on an Ubuntu 18.04 VPSRoundcube Webmail is a free and open-source web-based IMAP client, written in PHP. With its intuitive and desktop-like user interface, Roundcube provides an easy way for you to check and manage your emails using your web browser.