My 16.04 machine boots fine and gets to a GUI box with login banner to accept or cancel (I think this means lightdm has started at least), but after clicking OK it just keeps coming back to the box with the login banner. I reinstalled lightdm, unity, and unity-desktop but no change. I can get to the CTL-ALT-F# terminal easy enough and login so it seems like authentication is OK. Any suggestions and thanks in advance?

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