that was one of my ideas, i needed to call synaptic to remove kdm or gnome, when you reinstall kdm it removes theme and configs, what was the problem
but gnome didn't let me open synaptic
fortunately i could use, for the first time in 5+ years the last resource, apt-get
so, i wanted to remove the problem and the problem was gnome, i removed it with this command
i called from console apt-get remove gnome-shell
restarted and got system back to normal
thank you for your suggestions
about int 3, this didn't made a difference, but i remember that it worked in the past when i used the boot codes, maybe i was already in runlevel 3? or am i confusing things?