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There is a process of the installation of cuda 10.0 How to install NVIDIA CUDA Toolkit on CentOS 7 Linux where a repository is installed through, and then cuda can be installed by

rpm -i cuda-repo-rhel7-10.0.130-1.x86_64.rpm
yum install cuda

but installation fails because cuda 7.5 was already installed. Then I need to remove cuda 7.5 but I can't. There is no /usr/local/cuda directory and cannot find uninstallation command and nvcc locates in /usr/bin. I do not remember how to install cuda 7.5 then how can I remove coda 7.5 and install cuda 10.0?

The error message for "yum install cuda" which I remember is

Cuda 1:7.5... is already installed and it is the newest version.

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Firstly, check the installed package by

yum list installed

where I found

cuda.x86_64 1:7.5.18-3.el7.nux @nux-dextop

(I remember the package name is "cuda.x86_64") So I could remove cuda by

yum remove cuda.x86_64

When try to install cuda again, it will tried to install again coda 7.5.. So disable repo of nux-dextop by editing /etc/yum.repos.d/nux_dextop

sudo vi /etc/yum.repos.d/nux_dextop

[nux-dextop]

enabled=0

Then I could install coda 10.0 through

yum install cuda

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