1. Backup everything
sudo cp -a /var/www/html/roundcube /var/www/html/roundcube.backup
Also back up your Roundcube database:
mysqldump -u roundcube -p roundcube > roundcube.sql
2. Download Roundcube 1.7.2
cd /tmp wget https://github.com/roundcube/roundcubemail/releases/download/1.7.2/roundcubemail-1.7.2-complete.tar.gz tar -xzf roundcubemail-1.7.2-complete.tar.gz
3. Preserve your configuration
cp /var/www/html/roundcube/config/config.inc.php /tmp/
4. Replace the application files
sudo mv /var/www/html/roundcube /var/www/html/roundcube.old sudo mv /tmp/roundcubemail-1.7.2 /var/www/html/roundcube
5. Restore your configuration
sudo cp /tmp/config.inc.php /var/www/html/roundcube/config/
6. Upgrade the database
Open https://your-domain/roundcube/installer/When it finishes successfully, remove the installer:
sudo rm -rf /var/www/html/roundcube/installer
7. Fix permissions
sudo chown -R www-data:www-data /var/www/html/roundcube