Recently i needed to upgrade xampp php5.4 to php5.5.11 as php5.5.11 is stable release as per php official site http://in1.php.net/downloads.php so i was trying to upgrade the xampp ,but ubnutu app store the remove button was not working.so followed few step to upgrade. step1:please back up the htdocs folder and export sql file from phpmyadmin to reuse. step2: opem terrminal and run the code sudo rm -rf /opt/lampp which removes folder and files from lamp in ubuntu file syterm. step3:download installer file from https://www.apachefriends.org/download.html step4: run following code in terminal sudo chmod +x /home/globas/Downloads/xampp-linux-1.8.3-4-installer.run sudo /home/globas/Downloads/xampp-linux-1.8.3-4-installer.run This will open bitnami gui to install xampp. after installing open xampp by terminal by follwing code: sudo /opt/lampp/lampp start enjoy the day..............