sudo ls -l /var/lib/gdm/
-rw-r----- gdm gdm 0.Xauth
-rw-r--r-- gdm gdm 0.Wservers

sudo vim /var/lib/gdm/0.Xauth

vim gives this error:
"Unable to open swap file for "/var/lib/gdm/0.Xauth", Recovery impossible
Then it display an empty (new) file.

In dmesg, I didn't notice anything particular except the following :
- Apparmor: appArmo initialized
- Failure registering capabilities with primary security module
...
ACPI: Looking for DSDT in initramfs... error, file /DSDT.aml not found.
...
some "iomem range Ox... could not be reserved" errors

Reminded: When the problem happens (always on battery power), I can
reboot any number of time, it still won't work. The only way to make it
work again is to plug the laptop on sector power (I do not change
anything else). The problem IS related to the fact that the laptop is on
battery power or not. Moreover, I didn't have this issue with Gutsy.

-- 
Xorg fails to execute on Laptop when using battery
https://bugs.launchpad.net/bugs/234408
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