I encountered a problem that when startsteam.sh: line 755: 3142 Segmentation fault
I ran “DEBUGGER=gdb steam” and found that it is related to the 32bit nvidia GL library
So I uninstalled nvidia driver and uninstalled these two packages:
libgl1-mesa-dri:i386, libgl1-mesa-glx:i386
Then, reinstall the nvidia driver and open steam, it will you prompt you to install some i386 package(which is the above mentioned two packages), and then it works again.