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This is a legacy deployment procedure. Ubuntu 16.04 is end of life, and Ubuntu 18.04 left standard support on May 31, 2023. Use these instructions for an existing compatibility-bound server, preferably isolated and covered by a documented maintenance plan. For a new public forum, use a supported Ubuntu LTS and first test the FluxBB release against its PHP version.
FluxBB is lightweight and straightforward to run with Apache, PHP and MariaDB/MySQL, but its older codebase can fail on modern PHP. The commands below pin the historically associated PHP families: PHP 7.0 on Ubuntu 16.04 and PHP 7.2 on Ubuntu 18.04.
Before you begin
- SSH access with
sudoprivileges. - A DNS A/AAAA record pointing
forum.example.comto the server, if using a domain. - Ports 22, 80 and 443 allowed by your provider and firewall.
- A planned database name, database username and long random password.
- A backup destination for both the database and forum files.
Ubuntu documents Apache configuration under /etc/apache2/, including sites-available and sites-enabled. See Ubuntu’s Apache2 installation documentation. Ubuntu recommends sequential LTS upgrades rather than skipping releases; consult the release-upgrade guide before moving an old server.
Install Apache, PHP, MariaDB and utilities
These are historical package examples, not guarantees that obsolete repositories still work in 2026. Ubuntu 18.04’s Canonical page records PHP 7.2 among its application packages and states that standard support ended May 31, 2023: Ubuntu 18.04 LTS.
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Ubuntu 18.04 historical stack
sudo apt update
sudo apt install apache2 mariadb-server
php7.2 libapache2-mod-php7.2 php7.2-mysql
php7.2-curl php7.2-xml unzip wgetUbuntu 16.04 historical stack
sudo apt update
sudo apt install apache2 mariadb-server
php7.0 libapache2-mod-php7.0 php7.0-mysql
php7.0-curl php7.0-xml unzip wgetSome 16.04 installations used MySQL instead; substitute mysql-server if that is the database you have chosen. On an existing machine, package availability may require an archived image or repository. Do not casually expose an obsolete release to the internet; rebuilding on a supported LTS is safer.
Verify the stack:
php -v
apache2ctl -M | grep php
sudo systemctl status apache2 --no-pager
sudo systemctl status mariadb --no-pagerIf Apache is not loading the module, enable the version actually installed:
sudo a2enmod php7.2
sudo systemctl restart apache2On 16.04 use sudo a2enmod php7.0 instead. A generic php package on a current Ubuntu release may install a much newer PHP that FluxBB 1.5.x does not support, so test compatibility rather than assuming it is interchangeable.
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Create a dedicated database
Open MariaDB (or MySQL) as the administrative account:
sudo mariadbIf that command is unavailable on your older installation, try sudo mysql. Then create a private database and account:
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CREATE DATABASE fluxbb
CHARACTER SET utf8mb4
COLLATE utf8mb4_unicode_ci;
CREATE USER 'fluxbbuser'@'localhost'
IDENTIFIED BY 'REPLACE_WITH_A_LONG_RANDOM_PASSWORD';
GRANT ALL PRIVILEGES ON fluxbb.* TO 'fluxbbuser'@'localhost';
FLUSH PRIVILEGES;
EXIT;Use the same values in the web installer. Keep the password in a password manager; do not put a real password in shell history, screenshots or documentation. Older FluxBB releases may not handle every modern character-set or collation combination correctly. If installation fails on utf8mb4, use the character set recommended by that release rather than forcing a newer collation. Never grant this account global privileges.
Download and unpack FluxBB
Pin the package version you intend to test. Historical coverage documents FluxBB 1.5.10 at this release URL: LinuxHelp’s installation reference.
cd /tmp
wget https://fluxbb.org/download/releases/1.5.10/fluxbb-1.5.10.zip
unzip fluxbb-1.5.10.zip
sudo mkdir -p /var/www/fluxbb
sudo cp -a fluxbb-1.5.10/. /var/www/fluxbb/The exact current FluxBB release and PHP support range are not established here; verify the release documentation before substituting another archive.
Set ownership and safe permissions
sudo chown -R www-data:www-data /var/www/fluxbbDo not use chmod -R 777. If the installer reports that config.php must exist or be writable, grant only that file temporary access:
sudo touch /var/www/fluxbb/config.php
sudo chown www-data:www-data /var/www/fluxbb/config.php
sudo chmod 640 /var/www/fluxbb/config.phpFollow the installer’s specific permission warning; package behavior differs. After installation, restore restrictive permissions and ensure uploaded content cannot be executed as PHP.
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Configure an Apache virtual host
Create a site file:
sudo nano /etc/apache2/sites-available/forum.example.com.conf<VirtualHost *:80>
ServerName forum.example.com
DocumentRoot /var/www/fluxbb
<Directory /var/www/fluxbb>
Options FollowSymLinks
AllowOverride All
Require all granted
</Directory>
ErrorLog ${APACHE_LOG_DIR}/forum-error.log
CustomLog ${APACHE_LOG_DIR}/forum-access.log combined
</VirtualHost>Enable it and validate before reloading:
sudo a2ensite forum.example.com.conf
sudo a2enmod rewrite
sudo apache2ctl configtest
sudo systemctl reload apache2The expected validation result is Syntax OK. Ensure DNS points to this server and port 80 is open. If Apache displays its default page, inspect the mapping with sudo apache2ctl -S; you may need:
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sudo a2ensite forum.example.com.conf
sudo apache2ctl configtest
sudo systemctl reload apache2For a subdirectory deployment, place the files under /var/www/html/fluxbb and use http://SERVER_IP/fluxbb/ (or the equivalent domain path) instead of making it the virtual host’s document root.
Run the FluxBB web installer
Open the installer supplied by the package:
http://forum.example.com/install.phpfor a domain-root virtual host.http://SERVER_IP/fluxbb/install.phpfor a subdirectory installation.
Confirm the filename in your extracted package; do not assume every release uses the same installer path. Enter:
- Database type and server, normally
localhost. - The
fluxbbdatabase name, user and password created above. - A table prefix (the default is usually acceptable).
- An administrator username and strong password.
- Forum title and the exact base URL.
Use https://forum.example.com after TLS is configured, or https://example.com/fluxbb for a subdirectory. A wrong base URL commonly breaks redirects, cookies, stylesheets and login sessions.
Secure the completed installation
Find the installer before deleting it:
find /var/www/fluxbb -maxdepth 2 -iname '*install*' -type fRemove the installer file included by your package:
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sudo rm -f /var/www/fluxbb/install.php
sudo chmod 640 /var/www/fluxbb/config.php
sudo chown www-data:www-data /var/www/fluxbb/config.phpThen log in to the administrator panel, configure mail, review registration and avatar/upload settings, and enable anti-spam controls such as email verification and CAPTCHA. Test registration, login, posting, attachments, email and password reset.
Enable HTTPS
For a supported system, a typical Apache Certbot setup is:
sudo apt install certbot python3-certbot-apache
sudo certbot --apache -d forum.example.comOn obsolete Ubuntu releases, Certbot packages and renewal support may be unavailable; use a supported host or your provider’s documented TLS service. After HTTPS works, change FluxBB’s base URL, redirect HTTP to HTTPS, and check for mixed-content links. Add HSTS only after HTTPS and renewal are proven.
Back up files and database
mysqldump --single-transaction
-u fluxbbuser -p fluxbb > fluxbb-$(date +%F).sql
sudo tar -czf fluxbb-files-$(date +%F).tar.gz
-C /var/www fluxbbKeep copies away from the server. A backup is useful only after you restore it successfully in a test location.
Troubleshooting
HTTP 500, blank page or PHP fatal error
sudo tail -f /var/log/apache2/error.log
php -mLook for removed functions, missing extensions or a PHP version mismatch. A temporary phpinfo() page can show the PHP version Apache is using; delete it immediately. Do not hide errors or solve them with world-writable permissions. Pin a compatible runtime, patch the application or migrate to maintained software.
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- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
403 Forbidden
namei -l /var/www/fluxbb
ls -la /var/www/fluxbbCheck parent-directory search permissions, ownership, Require all granted, AppArmor and restrictive .htaccess rules.
Database connection failure
mysql -u fluxbbuser -p -h localhost fluxbbConfirm the service is running, the database values and password are exact, php-mysql is loaded, and the account is allowed from localhost.
Missing CSS, images or redirects
Compare the configured base URL with the actual domain or /fluxbb path. Also check DocumentRoot, rewrite rules and HTTP/HTTPS mixed URLs.
Package repositories no longer work
That is expected on an end-of-life release. Use a controlled legacy image or archived repository only temporarily, or rebuild on a supported LTS. Ubuntu’s ReleaseEndOfLife guidance explains the maintenance implications.
Should you use Ubuntu 16.04 or 18.04?
Only when an existing application or compatibility requirement leaves no practical alternative. Ubuntu 16.04 is end of life; Ubuntu 18.04 has been outside standard support since May 31, 2023, with additional coverage requiring Ubuntu Pro for applicable packages. Ubuntu Pro can help during migration, but it does not modernize FluxBB itself. For a new forum, choose a supported LTS, test the pinned FluxBB release against its shipped PHP, or evaluate maintained platforms such as phpBB, Flarum, Discourse, NodeBB or MyBB based on migration effort, resources, moderation and plugin needs.
If FluxBB must remain, isolate it in a VM or container, restrict administration, keep database ports private, monitor logs, maintain off-site backups and place a reverse proxy or WAF in front where appropriate.
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