Download all boost instead of a specific version.

Signed-off-by: Omar Shrit <omar@shrit.me>

.ci/linux-steps.yaml

@@ -21,7 +21,7 @@ steps:
     unset BOOST_ROOT
     echo "##vso[task.setvariable variable=BOOST_ROOT]"$BOOST_ROOT
 
-    sudo apt-get install -y --allow-unauthenticated libopenblas-dev g++ libboost1.70-dev xz-utils
+    sudo apt-get install -y --allow-unauthenticated libopenblas-dev g++ libboost-all-dev xz-utils
 
     if [ "$(binding)" == "python" ]; then
       export PYBIN=$(which python)
@@ -41,7 +41,7 @@ steps:
     # Install cereal.
     wget https://github.com/USCiLab/cereal/archive/v1.3.0.tar.gz
     tar -xvzpf v1.3.0.tar.gz # Unpack into cereal-1.3.0/.
-    cd cereal-1.3.0/
+
   displayName: 'Install Build Dependencies'
 
 # Configure mlpack (CMake)