Add sudo; avoid installing already available deps

Author: ejona86

buildscripts/kokoro/linux_artifacts.sh

@@ -35,12 +35,5 @@ mkdir -p "$MVN_ARTIFACT_DIR"
 cp -r "$LOCAL_MVN_TEMP"/* "$MVN_ARTIFACT_DIR"/
 
 # for aarch64 platform
-apt-get install -y wget autoconf automake libtool g++-aarch64-linux-gnu g++ make
-
-apt-get install software-properties-common -y
-add-apt-repository ppa:openjdk-r/ppa -y
-apt-get update
-apt install openjdk-8-jdk -y
-export JAVA_HOME=`dirname $(dirname $(update-alternatives --list javac |grep java-8))`
-update-ca-certificates -f
+sudo apt-get install -y g++-aarch64-linux-gnu
 SKIP_TESTS=true ARCH=aarch_64 ./buildscripts/kokoro/unix.sh