After startup PC fails to auto-connect the saved wifi login. But after clicking the Network Manager Applet and connect it can connect to the network. The temporary solution is: Network Manager > Settings > (Wifi Name) > Wifi-Security > Under Passwork selecting password for all user. I am not sure this a bug or this is meant to be in this way by devs. Thanks for reading.
*** This bug has been marked as a duplicate of bug 377473 ***
*** This bug has been marked as a duplicate of bug 387502 ***