Sometimes when you try to uninstall Gallery from Fantastico, you may get the following error:

Fatal error: Maximum execution time of 30 seconds exceeded in /usr/local/cpanel/3rdparty/fantastico//includes/enc_removeconfirm.inc.php on line 47

The solution in this case is to first delete your Gallery folder from your web hosting account and then uninstall Gallery from Fantastico. This way the uninstallation will be completed without errors.