Frequently, when opening LibreOffice Writer via Unity panel, or after that, when opening a doc or odt file, a general crash happens in user interface, the screen goes black or flashes, the whole system crashes. sometimes lightdm restarts and returns to the login screen.
I would like to report this bug, but do not know which log file should I attach to allow debugging.
Ubuntu 13.04 32bits
HP Pavilion dv6000
NVidia Graphics - GeForce 7150M / nForce 630M