CUDA incompatible with gcc version

[papatya2]

$ apt policy gcc
gcc : Installed : 4:5.3.1-1ubuntu1
Candidate : 4:5.3.1-1ubuntu1
Version table :
*** 4:5.3.1-1ubuntu1 500
500 http://tr.achive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status

$ inxi -S
No command 'inxi' found

$ apt-apt-cache policy gcc-5
gcc-5:
Installed:5.4.0-6ubuntu1~16.04.9
Candidate:5.4.0-6ubuntu1~16.04.9
Version table:
*** 5.4.0-6ubuntu1~16.04.9 500
500 http://tr.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
100 /var/lib/dpkg/status
5.3.1-14ubuntu2 500
500 http://tr.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages

Cuda doesn't support GCC 5.4.0.


$ ./mnistCUDNN

cudnnGetVersion() : 7005 , CUDNN_VERSION from cudnn.h : (7005) (7.0.5)
Cuda failurer version : GCC 5.4.0
Error : unknown error
error_util.h:93
Aborting...

Ubuntu 16.04.9 : Ubuntu 5.4.0-6ubuntu1 : GCC 5.4.0
CUDA Toolkit 9.1
Python3.6.4

http://docs.nvidia.com/cuda/cuda-ins...n-guide-linux/ (http://docs.nvidia.com/cuda/cuda-installation-guide-linux/)

CUDA Toolkit 9.1 supports gcc5.3.1.

How will I make my gcc version correct ?

[QIII]

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