After choosing Ubuntu 18.04 (LTS) and creating the lightsail instance and give the new instance a public static IP login to server ssh and try to update and upgrade ubuntu first using

$ sudo apt-get upgrade
$ sudo apt-get update

Create a Swap file if you think your server need a swap file.

Today while I Am searching for a simple solution to create .phar files google tooks me to a project called Box by Pádraic Brady on Github. The Box application simplifies the PHAR building process and helps to create .phar file from php project.