How to install MantisBT on Ubuntu 16.04

sudo su
apt update && apt upgrade -y
apt install -y apache2 libapache2-mod-php7.0 php7.0 php7.0-mysql php7.0-xml php-mbstring mysql-server
mysql -uroot -p
CREATE DATABASE mantisbt;
CREATE USER 'mantisbt'@'localhost' IDENTIFIED BY 'mantisbt';
GRANT ALL PRIVILEGES ON mantis.* TO 'mantisbt'@'localhost' IDENTIFIED BY 'mantisbt' WITH GRANT OPTION;
FLUSH PRIVILEGES;
exit

How to install Rocket.Chat on Ubuntu Server 16.04

Install required packages
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927
echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
apt update
apt install -y graphicsmagick build-essential mongodb-org nodejs

Start MongoDB
systemctl start mongod
systemctl enable mongod

Download and install Rocket.Chat
cd /opt
wget https://cdn-download.rocket.chat/build/rocket.chat-0.64.0.tgz
tar xzf rocket.chat-0.64.0.tgz
mv bundle Rocket.Chat
cd Rocket.Chat/programs/server
npm install
cd ../..
export ROOT_URL=http://localhost/
export MONGO_URL=mongodb://localhost:27017/rocketchat
export PORT=3000
node main.js

Ctrl+C to stop service