BookStack on Ubuntu 18.04 LTS / 20.04 LTS
My test platform: Ubuntu Server 18.04.3 and 20.04.1
Requirements:
- Ubuntu Server and user with root privileges or non-root user with sudo privileges
 - PHP >= 7.2 *
- For installation and maintenence, you’ll need to be able to run php from the command line
 - Required Extensions: OpenSSL, PDO, MBstring, Tokenizer, GD, MySQL, Tidy, SimpleXML & DOM
 
 - MySQL >= 5.6 *
- Single Database (All permissions advised since application manages schema)
 
 - Git Version Control *
 - Composer *
 
- Source: BookStack Admin Documentation