Ubuntu 12.10 unity won't start on startup

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http://askubuntu.com – I've just updated to Ubuntu 12.10 from 12.04, and now Unity won't automatically start on startup! I have to get around this problem every time I start my machine by pressing control+alt+t to get a pseudo-terminal, and starting Unity manually. How do I make Ubuntu 12.10 automatically start on startup? Also, is anyone else experience my problem? (HowTos)