Fix cpu instals in circleci (#7357)

Author: atalman

.circleci/unittest/linux/scripts/install.sh

@@ -22,6 +22,10 @@ else
     echo "Using CUDA $CUDA_VERSION as determined by CU_VERSION: ${CU_VERSION} "
     version="$(python -c "print('.'.join(\"${CUDA_VERSION}\".split('.')[:2]))")"
     cudatoolkit="pytorch-cuda=${version}"
+
+     # make sure local cuda is set to required cuda version and not CUDA version by default
+    rm -f /usr/local/cuda
+    ln -s /usr/local/cuda-${version} /usr/local/cuda
 fi
 
 case "$(uname -s)" in
@@ -34,10 +38,6 @@ if [ "${os}" == "MacOSX" ]; then
     conda install -y -c "pytorch-${UPLOAD_CHANNEL}" "pytorch-${UPLOAD_CHANNEL}"::pytorch "${cudatoolkit}"
 else
     conda install -y -c "pytorch-${UPLOAD_CHANNEL}" -c nvidia "pytorch-${UPLOAD_CHANNEL}"::pytorch[build="*${version}*"] "${cudatoolkit}"
-
-    # make sure local cuda is set to required cuda version and not CUDA version by default
-    rm -f /usr/local/cuda
-    ln -s /usr/local/cuda-${version} /usr/local/cuda
 fi