FIX: Trying to fix CI

.gitlab-ci.yml

-image: ubuntu:latest
+image: ubuntu:bionic
 
 before_script:
     - apt-get update
-    - apt-get install -y -qq make cmake libboost-test-dev g++-5
+    - apt-get install -y -qq g++-5
+    - apt-get install -y -qq make cmake libboost-test-dev
     - ./build.sh
 
 run_tests: