fix syntax

Dockerfile/Dockerfile

@@ -52,12 +52,13 @@ RUN if [[ "${BASE_IMAGE}" == amazonlinux* ]]; then \
     elif echo "${BASE_IMAGE}" | grep -q "ubuntu"; then \  
       export DEBIAN_FRONTEND=noninteractive && \  
       apt-get update && \  
-      apt-get install -y wget systemd linux-headers-$(uname -r) || apt-get install -y linux-headers-generic && \  
+      apt-get install -y wget systemd && \  
+      apt-get install -y linux-headers-$(uname -r) || apt-get install -y linux-headers-generic && \  
       apt-get install -y ocl-icd-libopencl1 lsb-release dkms udev python3 ocl-icd-opencl-dev uuid-dev libboost-filesystem1.65.1 libboost-program-options1.65.1 libboost-system1.65.1 libprotobuf10 libyaml-0-2 && \  
       dpkg -i /tmp/${PACKAGE_FILE} || apt-get install -f -y && \  
       sed -i 's/systemctl/#systemctl/g' /var/lib/dpkg/info/xrt.postinst && \  
       rm -f /tmp/${PACKAGE_FILE} && \  
-      dpkg -l | grep xrt;   
+      dpkg -l | grep xrt;  
     else \  
       echo "Unsupported base image: ${BASE_IMAGE}"; \  
       exit 1; \