367.57 is the current Recommended Linux release. 370.23 is the current Beta linux release. Where did you find the 375.10 for Linux?

I tried installing 367.57 to see if that worked for my GTX 670 under Ubuntu 14.04.3. I got the same error you did. I eventually determined it was because BOINC keeps the driver loaded even when it's not running a GPU WU. So you'll need to add
service boinc-client stop
to the list of things you stop. As the next command after the gdm stop command should work fine. It then allowed me to update the drivers just fine.

Code:
09-Nov-2016 21:14:08 [---] CUDA: NVIDIA GPU 0: GeForce GTX 670 (driver version 367.57, CUDA version 8.0, compute capability 3.0, 1997MB, 1964MB available, 2915 GFLOPS peak)
09-Nov-2016 21:14:08 [---] OpenCL: NVIDIA GPU 0: GeForce GTX 670 (driver version 367.57, device version OpenCL 1.2 CUDA, 1997MB, 1964MB available, 2915 GFLOPS peak)
Once the drivers were updated, I just started the boinc-client service again. Too bad that still didn't get successful work out of the project. I'm trying the Beta drivers next.