Finally it seems that it was a hardware problem.
Although memtest86 ran for 40h without any error, RAM was my last hope and I convinced Dell to change it.
Now it's been 2 months without crash. So I guess that was it !
(phew... almost 2 years of bug searching...)
Sorry for this; apparently this was not a ubuntu bug !
Finally it seems that it was a hardware problem.
Although memtest86 ran for 40h without any error, RAM was my last hope and I convinced Dell to change it.
Now it's been 2 months without crash. So I guess that was it !
(phew... almost 2 years of bug searching...)
Sorry for this; apparently this was not a ubuntu bug !