After the last update to my El Capitan Server to the last server version, after reboot, I have lost all capability to launch any apple app from the gui. For all App I get the message : Cannot open application X, it is either damaged or incomplete. This is a translation as the message is in French and the preference App will not open anymore, so I cannot change my language. Also, many icons have a bland unknown app icon. Now, what is weird, is that I have a second user with administrative privileges. This user is unaffected by the problem and I can load all the apps. This is my main corporate server and I really do not want to reinstall and reconfigure the server anew. Anyone has a solution ? I have tried this link, but it does not work.