am getting same error here. in addition of missing "install button' ;
I have tried this
1- supplying dataroot parameter via command line using
$ sudo -u apache php mdeploy.php [options]. // it didnt change anything
2- enabled updateautodeploy in moodle GUI
3- added this line $CFG->disableupdateautodeploy = false; to config.php
4- changed file permissons of mdeploy.php to 777, temporarily.
5- edited the mdeploy.php and manually inserted the values of
$dataroot = 'PATH/TO/MOODLEDATA'; // after doing this , error changed to 'Missing required option: passfile'
$passfile = 'PATH/TO/PASSFILE'; // after doing this , error changed to 'Missing required option: password'
$password = 'ADMINPASSORD'; // the page went blank from here
am i missing something here?