diff --git a/package/linux/prepare-system.sh b/package/linux/prepare-system.sh
index 7c87850b72..13117a1f6f 100644
--- a/package/linux/prepare-system.sh
+++ b/package/linux/prepare-system.sh
@@ -1,44 +1,49 @@
 #!/usr/bin/env bash
+#
+# Install dependencies necessary for releasing Bisq on Debian-like systems.
+#
+cd $(dirname ${0})
+set -eu
 
-cd $(dirname $0)
-
-echo Update OS
-
+echo "Updating OS.."
 sudo apt-get update
 sudo apt-get upgrade
 sudo apt-get dist-upgrade
 
-if [ ! -f "$JAVA_HOME/jre/lib/security/local_policy.jar" ]
-then
-echo "Enable strong crypto support for Java"
+if [ ! -f "${JAVA_HOME}/jre/lib/security/local_policy.jar" ]; then
+    echo "Enabling strong crypto support for Java.."
 
-wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jce/8/jce_policy-8.zip
+    wget --no-check-certificate --no-cookies --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jce/8/jce_policy-8.zip
 
-checksum=f3020a3922efd6626c2fff45695d527f34a8020e938a49292561f18ad1320b59 # see https://github.com/jonathancross/jc-docs/blob/master/java-strong-crypto-test/README.md
+    checksum=f3020a3922efd6626c2fff45695d527f34a8020e938a49292561f18ad1320b59 # see https://github.com/jonathancross/jc-docs/blob/master/java-strong-crypto-test/README.md
 
-if ! echo "$checksum jce_policy-8.zip" | sha256sum -c -;
-then
-    echo "Checksum failed" >&2
-    exit 1
-fi
+    if ! echo "${checksum} jce_policy-8.zip" | sha256sum -c -; then
+        echo "Bad checksum for ${jce_policy-8.zip}." >&2
+        exit 1
+    fi
 
-unzip jce_policy-8.zip
-sudo cp UnlimitedJCEPolicyJDK8/{US_export_policy.jar,local_policy.jar} $JAVA_HOME/jre/lib/security/
-sudo chmod 664 $JAVA_HOME/jre/lib/security/{US_export_policy.jar,local_policy.jar}
-sudo rm -rf UnlimitedJCEPolicyJDK8 jce_policy-8.zip
+    unzip jce_policy-8.zip
+    sudo cp UnlimitedJCEPolicyJDK8/{US_export_policy.jar,local_policy.jar} ${JAVA_HOME}/jre/lib/security/
+    sudo chmod 664 ${JAVA_HOME}/jre/lib/security/{US_export_policy.jar,local_policy.jar}
+    sudo rm -rf UnlimitedJCEPolicyJDK8 jce_policy-8.zip
 else
-echo "Strong Crypto support for Java already available"
+    echo "Strong Crypto support for Java already available."
 fi
 
 bouncyCastleJar=bcprov-jdk15on-1.56.jar
 
-if [ ! -f "$JAVA_HOME/jre/lib/ext/$bouncyCastleJar" ]
-then
-echo Configure Bouncy Castle
-
-wget "http://central.maven.org/maven2/org/bouncycastle/bcprov-jdk15on/1.56/$bouncyCastleJar"
-sudo mv $bouncyCastleJar $JAVA_HOME/jre/lib/ext/
-sudo chmod 777 "$JAVA_HOME/jre/lib/ext/$bouncyCastleJar"
+if [ ! -f "${JAVA_HOME}/jre/lib/ext/${bouncyCastleJar}" ]; then
+    echo "Configuring Bouncy Castle.."
+    checksum="963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349"
+    wget "http://central.maven.org/maven2/org/bouncycastle/bcprov-jdk15on/1.56/${bouncyCastleJar}"
+    if ! echo "${checksum} ${bouncyCastleJar}" | sha256sum -c -; then
+        echo "Bad checksum for ${bouncyCastleJar}." >&2
+        exit 1
+    fi
+    sudo mv ${bouncyCastleJar} ${JAVA_HOME}/jre/lib/ext/
+    sudo chmod 777 "${JAVA_HOME}/jre/lib/ext/${bouncyCastleJar}"
 else
-echo Bouncy Castle already configured
+    echo "Bouncy Castle already configured."
 fi
+
+echo "Done."