I'd always, always, always recommend the distribution packages.
The guys that make these packages have got the original driver from the website as well, but additionally they know more about your distribution and dependencies that might be needed.

solved using distribution packages. from driver manager.

Cool! :)

I am running into the same issue but the script seems to be slightly different as it is failing on line 755 for me (installed from the Ubuntu Software Center). I am running Ubuntu 14.04 with the 340.58 Nvidia drivers with an EVGA 750Ti video card. Unlike the poster above, I see no suggested driver packages when I go to Software & Updates -> Additional Drivers (no additional drivers available). For what it is worth, this is basically a fresh install of the OS, I have simply installed the Ubuntu updates and the Nvidia drivers and Steam.

foo@ragnarok:~$ Running Steam on ubuntu 14.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1416617579_client)
/home/foo/.steam/steam.sh: line 755: 3477 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"
mv: cannot stat ‘/home/foo/.steam/registry.vdf’: No such file or directory
Installing bootstrap /home/foo/.steam/bootstrap.tar.xz
Reset complete!
Restarting Steam by request...
Running Steam on ubuntu 14.04 64-bit
STEAM_RUNTIME has been set by the user to: /home/foo/.steam/ubuntu12_32/steam-runtime
Installing breakpad exception handler for appid(steam)/version(1416617579_client)
/home/foo/.steam/steam.sh: line 755: 3600 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$PLATFORM/$STEAMEXE" "$@"

Thanks in advance.

Wanted to reply with a solution that has worked for me, and hopefully this will help others as this general problem seems to be affecting many.

To restate, I am using the proprietary Nvdia drivers 340.58 on an EVGA 750Ti video card with Ubuntu 14.04 LTS x64. The fix was rather simple in the end. From the state above, I ran the following:

1) Switch to a console (CTRL-ALT-F1) and log in
2) Stop the X server - sudo service lightdm stop
3) Install steam again "sudo apt-get install steam -y" -- there were 0 packages upgraded and may not be a required step...but can't hurt.
4) re-run the Nvidia installer - "sudo ./nvidia-installer" (I simply selected the defaults).
5) restart X (sudo service lightdm start)

At this point, launching steam was successful and the Updater launched as expected and things seem to be working wonderfully.

From the fix, it seems that there is some sort of dependency on a library that steam requires and is used by the video driver. Re-compiling the binary with the lightdm service stopped seems to be the key step. Unlike some guides, it was not necessary to actually uninstall the driver itself.

Hope this helps.

this helps a lot! :)

I just recently fresh installed 14.04.1 x64 early Jan 2015. Apparently nvidia-current (which is an old 304 version) did not support my GTX 750 Ti with new Maxwell chip (judging from logs), so I intially could not even log into X. From Recovery boot I enabled networking, went to root console, purged nvidia-current and installed nvidia-331 and that worked.

I copied my home over from 12.04 x64, installed Steam from Software Center and everything worked. I have since added xorg-edgers ppa and switched to nvidia-346 (currently 346.35), so I could play around with video overclocking (which requires nvidia 337 or newer).

Switching from EVGA GTX 550 Ti to MSI Twin Frozr Gaming GTX 750 Ti OC dropped power consumption (Kill A Watt meter on AC input) from about 206 watts max to barely over 150 watts max, and dropped idle from 75w to about 50w. Some things run twice as fast as the GTX 550 Ti, some nearly the same. TF2 runs triple digit fps in high settings most of the time.