Joomla! is an open source content management system (CMS). Many web site built using Joomla!. So I want to share how to install Joomla! 4 on your Ubuntu 18.04 server.

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Remember : My video is using php 7.2, but this is not working. So please use below this code for install 3.9.24 version using php 7.3.

Step #01: Install web server, database server & php for required Joomla! install.

root@Joomla-CMS:~# vi /etc/resolv.conf
Insert nameserver 8.8.8.8
then save it
root@Joomla-CMS:~# apt-get update
root@Joomla-CMS:~# apt-get upgrade -y
root@Joomla-CMS:~# sudo add-apt-repository ppa:ondrej/php
root@Joomla-CMS:~# apt-get update
root@Joomla-CMS:~# apt -y install php7.3
root@Joomla-CMS:~# 
root@Joomla-CMS:~# apt-get install apache2 mariadb-{server,client} php-pear php7.3-curl php7.3-dev php7.3-gd php7.3-mbstring php7.3-zip php7.3-mysql php7.3-xml php7.3-fpm libapache2-mod-php7.3 php7.3-imagick php7.3-recode php7.3-tidy php7.3-xmlrpc php7.3-intl
root@Joomla-CMS:~# systemctl is-active mysql
root@Joomla-CMS:~# mysql_secure_installation

Step #02: Setup secure installation for create root password.

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.

Enter current password for root (enter for none):
OK, successfully used password, moving on...

Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.
Set root password? [Y/n] y
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..
 ... Success!

By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] y
 ... Success!

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!

Step #03: Create database for store all data.

Login mysql terminal using below command and then type root password.

root@Joomla-CMS:~# mysql -u root -p

Create database and user using below command

create database joomladb;
grant all privileges on joomladb.* TO 'dbuser'@'localhost' identified by 'passw0rd';
flush privileges;
\q

Step #04: Setup time & date from apache php config file.

root@Joomla-CMS:~# sed -i 's/output_buffering = 4096/output_buffering = Off/' /etc/php/7.2/apache2/php.ini
root@Joomla-CMS:~# vi /etc/php/7.2/apache2/php.ini   //Edit php time zone date.timezone =Asia/Dhaka
root@Joomla-CMS:~# cd /var/www/html

Step #05: Download & extract Joomla! then restart web server.

root@Joomla-CMS:/var/www/html# wget https://github.com/joomla/joomla-cms/archive/3.9.24.tar.gz
root@Joomla-CMS:/var/www/html# tar xf Joomla_4.0.0-alpha3-Alpha-Full_Package.tar.gz
root@Joomla-CMS:/var/www/html# mv htaccess.txt .htaccess
root@Joomla-CMS:/var/www/html# rm -rf index.html
root@Joomla-CMS:/var/www/html# chown www-data:www-data -R /var/www/html
root@Joomla-CMS:/var/www/html# service apache2 restart

Now browse your Joomla server ip address and setup from web

http://10.66.25.10/

Step #06: Setup login admin account type user name, password and email address.

Step #07: Joomla! database configuration collect from step #03.

After complete installation process then login and using Joomla!.

If any error please see my YouTube channel and this video. Don’t forget subscribe my channel.