making DIGITS running with 1080ti, under 14.04

Hi, I am not so experienced with linux but I have made some search on web and tested advises, all failed to make digits run after 381.22 driver installation.

I have installed latest driver with following commands;

sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-381

Then rebooted.

nvidia-smi

command displayed 381.22 version on both sides, but there were no GPU available in DIGITS web page.

I tried

sudo apt-get remove digits

then

sudo apt-get install digits

Then;

./device_query.py
cudaRuntimeGetVersion() failed with error #35
No devices found.

I guess I messed up everything? Do you know any safe route to make DIGITS working again?

Regards,