Get the latest at https://github.com/xmrig/xmrig/releases and for nvidia cards you also need the CUDA plugin from https://github.com/xmrig/xmrig-cuda.You have to compile the CUDA plugin yourself.put the xmrig-cuda.so in the same directory as where you put xmrig. So any questions abt xmrig should be asked there.
xmrig-nvidia is outdated and as far as I know abandoned.
For compiling I use the following in a script:
`
#!/bin/bash

#set -x
#no need for the following packages
#libhwloc-plugins libhwloc-contrib-plugins

echo
echo 'Now it'''s time to get a coffee, tea or any other beverage'
echo 'as it will take a while to finish compiling depending on'
echo 'how fast your system is (just over 6 mins. i7-7700HQ 16GB RAM'
echo 'or just over 4 mins. 5800x 32GB RAM.'
echo 'Ignore the warnings generated.'
echo 'When finished copy or move libxmrig-cuda.so to the'
echo 'directory where xmrig miner is installed.'
echo

read -p 'Press any key to continue'

#sudo apt-get install nvidia-cuda-toolkit

git -C /media/Public/github clone https://github.com/xmrig/xmrig-cuda.git

mkdir $HOME/github/xmrig-cuda/build && cd $HOME/github/xmrig-cuda/build

cmake /media/Public/github/xmrig-cuda -DCUDA_TOOLKIT_ROOT_DIR=/usr/lib/nvidia-cuda-toolkit

make -j$(nproc)

echo
echo 'IT'''S FINISHED, HURRAY!!'
`
Change it to any directory you want.

from xmrig-nvidia.