Ubuntu 26.04

How to Install PHP 8.5 on Ubuntu 26.04

To install PHP 8.5 on Ubuntu 26.04, use the distro packages. This guide covers the Apache module and PHP-FPM (socket /run/php/php8.5-fpm.sock). Defaults are 128M / 2M / 30s; raise them on the web SAPI, not only CLI.

Step 1 : Update.

sudo apt update

Step 2 : Install PHP 8.5, CLI, and PHP-FPM.

sudo apt install php8.5 php8.5-cli php8.5-fpm

Step 3 : Install common extensions. Also cgi if you need it. Common extensions: mysql, curl, gd / imagick, xml / xsl / soap, zip, mbstring, bcmath. gettext is in php8.5-common.

sudo apt install php8.5-mysql php8.5-curl php8.5-xsl php8.5-gd php8.5-common php8.5-xml php8.5-zip php8.5-soap php8.5-bcmath php8.5-mbstring php8.5-imagick php8.5-cgi

Step 4 : Check the version.

php -v

Step 5 : If you use Apache, install the module.

sudo apt install libapache2-mod-php8.5

Step 6 : Enable the module and restart Apache.

sudo a2enmod php8.5
sudo systemctl restart apache2

Step 7 : If you use Nginx, PHP-FPM listens on /run/php/php8.5-fpm.sock. Restart it.

sudo systemctl restart php8.5-fpm

Step 8 : If you use Apache. Defaults: memory_limit 128M, upload_max_filesize 2M, post_max_size 8M, max_execution_time 30. php -i is CLI (/etc/php/8.5/cli/php.ini) — that does not apply to web uploads. Set 512M / 100M / 100M / 300.

sudo sed -i 's/^memory_limit = .*/memory_limit = 512M/' /etc/php/8.5/apache2/php.ini
sudo sed -i 's/^upload_max_filesize = .*/upload_max_filesize = 100M/' /etc/php/8.5/apache2/php.ini
sudo sed -i 's/^post_max_size = .*/post_max_size = 100M/' /etc/php/8.5/apache2/php.ini
sudo sed -i 's/^max_execution_time = .*/max_execution_time = 300/' /etc/php/8.5/apache2/php.ini
sudo systemctl restart apache2

Step 9 : If you use Nginx, PHP-FPM uses the same values. Nginx defaults client_max_body_size to 1m (413 if you skip this). conf.d is included from http { }. Nginx must already be installed.

sudo sed -i 's/^memory_limit = .*/memory_limit = 512M/' /etc/php/8.5/fpm/php.ini
sudo sed -i 's/^upload_max_filesize = .*/upload_max_filesize = 100M/' /etc/php/8.5/fpm/php.ini
sudo sed -i 's/^post_max_size = .*/post_max_size = 100M/' /etc/php/8.5/fpm/php.ini
sudo sed -i 's/^max_execution_time = .*/max_execution_time = 300/' /etc/php/8.5/fpm/php.ini
echo 'client_max_body_size 100M;' | sudo tee /etc/nginx/conf.d/upload-size.conf
sudo nginx -t
sudo systemctl restart php8.5-fpm
sudo systemctl reload nginx

You have installed PHP 8.5 on Ubuntu 26.04.