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My current system is based on :

  • Ubuntu 12.04
  • VirtualBox 4.2.12 (Windows 7 Host / Ubuntu Guest)
  • VirtualBox additions 4.2.13-85100 (because additions 4.2.12 are buggy with Ubuntu 12.04)

But since my last software automatic update, I am unable to logon : I only have a black screen. I have already tried to reinstall gdm and ubuntu-desktop using the CTRL+ALT+F1 terminal but it does not change anything. How can I try to solve that problem ?

Here is a cat of the last element of /var/log/apt.history.log update

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