Thanks.
After I uninstalled the 16.04 nvidia-340 package, rebooted (so using Nouveau), then installed the nvidia-340_340.96-0ubuntu6_amd64.deb package, Steam and other programs seem to be working fine now.
Thanks.
After I uninstalled the 16.04 nvidia-340 package, rebooted (so using Nouveau), then installed the nvidia- 340_340. 96-0ubuntu6_ amd64.deb package, Steam and other programs seem to be working fine now.