Upgrade from 2.5 to 3.6.0 fails
From Joomla! Documentation
Joomla!
3.6.0
Errors reported[edit]
If you want to upgrade from 2.5.28 to 3.6.0 you get errors like:
Notice: Undefined property: LoginController::$input in ...administrator\components\com_login\controller.php on line 36
Fatal error: Call to a member function set() on null in ...administrator\components\com_login\controller.php on line 36
Versions affected[edit]
General Information
This pertains only to Joomla! version(s): 3.6.0
What is the cause[edit]
If you upgrade from 2.5 to 3.6.0 we did not remove some old files that get now loaded before the new ones. This will be fixed with 3.6.1.
How to fix[edit]
Wait for 3.6.1 (released soon) or see: https://github.com/joomla/joomla-cms/pull/11282