I followed some of the steps described on the very good wiki:
https://wiki.ubuntu.com/X/Troubleshooting

> Adjust ACPI settings
>   * In /etc/default/acpi-support, set SAVE_VBE_STATE=false
>   * In /etc/default/acpi-support, set SAVE_VIDEO_PCI_STATE=true
>   * In /etc/default/acpi-support, set POST_VIDEO=false

I don't know which parameter fixed the problem but I can logout normally now.
I hope that this can help somebody else...

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Logout proces hangs
https://bugs.launchpad.net/bugs/38915
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