I've just tried what you tell Ming and it seems I didn't do the things
perfectly.
First I disabled lightdm, and not gdm: ok
After a reboot, once loged on my pc on the tty1, I try the command:
sudo echo 9 > /proc/sys/kernel/printk
Here is the problem, it answers me:
bash: /proc/sys/kernel/printk: Permission non accordée
(not allowed)
I however tried a reboot and I attach the two syslog files I found in
the folder /var/log/ to this message. Maybe useless, I don't know cause
I don't understand everything I did.
** Attachment added: "syslog.tar.gz"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/993610/+attachment/3251531/+files/syslog.tar.gz
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https://bugs.launchpad.net/bugs/993610
Title:
[Dell Latitude 5520] System locks up when trying to reboot
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