May still be worth checking your theanorc file since the same error can happen 
in windows:

Add the following lines to .theanorc:
        [nvcc]
        flags=--cl-version=2015 -D_FORCE_INLINES
if you do not include the cl-version then you get the error:

nvcc fatal : nvcc cannot find a supported version of Microsoft Visual Studio. 
Only the versions 2010, 2012, and 2013 are supported

the D_FORCE_INLINES part is for an Ubuntu bug although I'm not sure it's 
necessary anymore. It can help prevent this error:

WARNING (theano.sandbox.cuda): CUDA is installed, but device gpu0 is not 
available (error: cuda unavailable)

Note: This error seems to also show if the g++ version is too new for the CUDA 
version.

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