For me, this problem occurs in firefox and epiphany. I'm running the amd64 distribution on my intel core2duo. I installed epiphany after firefox did this reliably 8 times in a row. After I figured out that going to ubuntu guide was causing the problem in firefox, I installed epiphany and can still reliably reproduce the crash. I have an Nvidia 8800GTS, since that seems to be the unifying theme, and I'm running with the drivers that were automatically chosen for me when I accepted the restricted drivers dialog.
For me, this problem occurs in firefox and epiphany. I'm running the amd64 distribution on my intel core2duo. I installed epiphany after firefox did this reliably 8 times in a row. After I figured out that going to ubuntu guide was causing the problem in firefox, I installed epiphany and can still reliably reproduce the crash. I have an Nvidia 8800GTS, since that seems to be the unifying theme, and I'm running with the drivers that were automatically chosen for me when I accepted the restricted drivers dialog.