Unable login after upgrade

[satimis]

Hi all,


Host Ubuntu 12.04 desktop 64bit
Gusest Ubuntu 12.04 desktop 64bit
Oracle VirtualBox

I tried upgrade Guest from 12.04 to 14.04. On terminl running;

$ sudo apt-get update && sudo apt-get upgrade

Then
$ sudo update-manager -d

On reboot I couldn't login with warning:
Code:
Failed to load session "ubuntu"
Log Out
I found following link:
Failed to load session ''ubuntu'' after Upgrade
12.04 - Failed to load session ''ubuntu'' after Upgrade - Ask Ubuntu

Please advise how to start Guest on tty 1?

Thanks

Rgds
satimis

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