Comment 43 for bug 873495

Thank you very much Alberto for your prompt answer.

Indeed, the problem was numlockx. It wasn't installed. And I don't want to install it, because the tune tip won't work, since I log in with a password, and I don't have a separate numeric keyboard, according to the 2.6th recommended action from this site. https://sites.google.com/site/easylinuxtipsproject/first

So, when I deleted that line at /etc/lightdm/lightdm.conf, the problem was PARTIALLY resolved, because the guests and root account log in, but my principal account still doesn't.

In addition of that, the first blue image that shows after the grub neither appears in the nvidia-319 driver, but it does when I activate the X.Org X server driver, xserver-xorg-video-nouveau, so I would like to know why it occurs. Before it happened, I had to shut down my laptop by force (on/off button), because the shut down process had friezed, and it didn't shut down by itself.

I suspect that there are several problems with X.Org... So I've tar'ed the /var/log/lightdm directory and /var/log/Xorg.0.log at the same tar.

Is it necessary to reset my principal account? Is there something that I could do for repair it?

Thank you very much for all.