Ubuntu Installation

Do not forget to change the default username/password.
Do not allow everybody to access the directory data from the URL.
Enable .htaccess if you use Apache (Option AllowOverride All).
This is your responsability to configure your server correctly.

Ubuntu Focal Fossa 20.04 LTS

Install Apache and PHP:

sudo apt update
sudo apt install -y apache2 libapache2-mod-php php-cli php-mbstring php-sqlite3 php-opcache php-json php-mysql php-pgsql php-ldap php-gd php-xml

(or) Install Nginx and PHP:

sudo apt update
sudo apt install nginx php-fpm php-mysql php-pgsql php-gd php-mbstring php-sqlite3 php-xml

Install Kanboard:

#adapt version number
version=1.2.24

# Download the latest release from https://github.com/kanboard/kanboard/releases
wget https://github.com/kanboard/kanboard/archive/v$version.tar.gz
tar xzvf v$version.tar.gz -C /var/www/html/
chown -R www-data:www-data /var/www/html/kanboard-$version/data

rm v$version.tar.gz

You might need to enable PHP extensions with the command phpenmod.
Some features of Kanboard requires that you run a daily background job.

Ubuntu Bionic 18.04 LTS

Install Apache and PHP:

sudo apt-get update
sudo apt-get install -y apache2 libapache2-mod-php7.2 php7.2-cli php7.2-mbstring php7.2-sqlite3 \
    php7.2-opcache php7.2-json php7.2-mysql php7.2-pgsql php7.2-ldap php7.2-gd php7.2-xml

(or) Install Nginx and PHP:

sudo apt-get update
sudo apt-get install nginx php7.2-fpm php7.2-mysql php7.2-pgsql php7.2-gd php7.2-mbstring php7.2-sqlite3 \
    php7.2-xml

Install Kanboard:

cd /var/www/html

# Download the latest release from https://github.com/kanboard/kanboard/releases
wget https://github.com/kanboard/kanboard/archive/v<version>.zip

unzip kanboard-<version>.zip
chown -R www-data:www-data kanboard-<version>/data
rm kanboard-<version>.zip

You might need to enable PHP extensions with the command phpenmod.
Some features of Kanboard requires that you run a daily background job.