diff --git a/ci/scripts/common.linux.before_script.sh b/ci/scripts/common.linux.before_script.sh
index 9222a843e..509bffa9b 100644
--- a/ci/scripts/common.linux.before_script.sh
+++ b/ci/scripts/common.linux.before_script.sh
@@ -16,9 +16,7 @@ export | grep EIGEN
 # geographical region.
 export DEBIAN_FRONTEND=noninteractive
 apt-get update -y > /dev/null
-apt-get install -y --no-install-recommends software-properties-common ninja-build cmake git > /dev/null
-add-apt-repository -y ppa:ubuntu-toolchain-r/test > /dev/null
-apt-get update -y > /dev/null
+apt-get install -y --no-install-recommends ninja-build cmake git > /dev/null
 
 # Install required dependencies and set up compilers.
 # These are required even for testing to ensure that dynamic runtime libraries