I messed up terminator, I tried to use some commands in the preferences and now it doesn't work anymore, it starts and exits immediately, I tried reinstalling it using synaptic manager, but that didn't work either. I searched didn't find anything.
I still can use xterm.
The settings for most programs are kept either in "dot folders" in your $HOME directory (for example, $HOME/.libreoffice) or in your $HOME/.config/ directory.
terminator uses the latter approach so any changes you made to your preferences would be saved in $HOME/.config/terminator. Deleting or renaming that folder and then launching terminator again should solve your problems (and also lose any changes you have made, including the ones you may want to keep):
mv $HOME/.config/terminator $HOME/.config/terminator_old
