Joomla Update Missing in from Admin Menu
From Joomla! Documentation
Revision as of 12:55, 18 June 2012 by Sueter
Starting with version 2.5.4, the Joomla core is updated with the new component Joomla Update instead of in Extensions/Install/Update. If Joomla Update shows as an installed component but is not in the Admin Menu under Components, you are missing the entry in the database table #__menus.