diff --git a/strcalc/src/test/java/com/mike_bland/training/testing/stringcalculator/WebApplicationTest.java b/strcalc/src/test/java/com/mike_bland/training/testing/stringcalculator/WebApplicationTest.java
index bca0596..5999bed 100644
--- a/strcalc/src/test/java/com/mike_bland/training/testing/stringcalculator/WebApplicationTest.java
+++ b/strcalc/src/test/java/com/mike_bland/training/testing/stringcalculator/WebApplicationTest.java
@@ -16,8 +16,10 @@
 import org.openqa.selenium.WebDriver;
 import org.openqa.selenium.WebElement;
 import org.openqa.selenium.chrome.ChromeDriver;
+import org.openqa.selenium.chrome.ChromeDriverService;
 import org.openqa.selenium.chrome.ChromeOptions;
 
+import java.io.File;
 import java.io.IOException;
 import java.net.URI;
 import java.time.Duration;
@@ -41,13 +43,76 @@ static void setUpClass() throws IOException, InterruptedException {
 
     @BeforeEach
     void setUp() {
+        driver = getChromeDriver();
+    }
+
+    // Return a fully configured ChromeDriver instance.
+    //
+    // If /usr/bin/chromium if present, it will use this browser and set the
+    // ChromeDriver instance to /usr/bin/chromedriver. This is because Google
+    // Chrome isn't yet available for arm64 Linux, and WebDriver doesn't
+    // download the correct driver, either:
+    //
+    // - https://developer.chrome.com/blog/chrome-for-testing
+    // - https://googlechromelabs.github.io/chrome-for-testing/
+    // - https://github.com/GoogleChromeLabs/chrome-for-testing#json-api-endpoints
+    // - https://github.com/SeleniumHQ/selenium/issues/11357#issuecomment-1664270630
+    //
+    // It also won't work with a snap-installed version of Chromium. At the time
+    // of writing, I installed Chromium by upgrading to Ubuntu 23.10
+    // and following the following advice to install Chromium from Debian:
+    //
+    // - https://askubuntu.com/questions/1179273/how-to-remove-snap-completely-without-losing-the-chromium-browser/1206502#1206502
+    //
+    // For future reference, this is how to install the non-snap version of
+    // Firefox from Mozilla:
+    //
+    // - https://www.omgubuntu.co.uk/2022/04/how-to-install-firefox-deb-apt-ubuntu-22-04
+    //
+    // Also of note: Upgrading to Ubuntu 23.10 will not automatically upgrade
+    // any Docker packages installed via:
+    //
+    // - https://docs.docker.com/engine/install/ubuntu/#install-using-the-repository
+    //
+    // The effect is that the Docker container will run, but nothing can
+    // connect to its ports. This will cause the WebDriver tests to hang
+    // (until we move away from using Docker and running Tomcat directly).
+    //
+    // To fix it:
+    //
+    // ```sh
+    // sudo apt remove docker-ce docker-ce-cli containerd.io \
+    //   docker-buildx-plugin docker-compose-plugin
+    //
+    // # Get the value of VERSION_CODENAME from /etc/os-release or
+    // # `lsb_release -cs`. Update the codename in the following file with
+    // # this value. Going from Ubuntu 22.04 to 23.10, this will replace
+    // # "jammy" with "mantic".
+    // sudo vim /etc/apt/sources.list.d/docker.list
+    //
+    // sudo apt install docker-ce docker-ce-cli containerd.io \
+    //   docker-buildx-plugin docker-compose-plugin
+    // ```
+    public ChromeDriver getChromeDriver() {
         // - https://www.selenium.dev/documentation/webdriver/browsers/chrome/
         // - https://github.com/GoogleChrome/chrome-launcher/blob/main/docs/chrome-flags-for-tools.md
         // - https://peter.sh/experiments/chromium-command-line-switches/
         var options = new ChromeOptions();
         options.addArguments("--headless");
         options.setImplicitWaitTimeout(Duration.ofMillis(500));
-        driver = new ChromeDriver(options);
+
+        var chromiumBrowser = new File("/usr/bin/chromium");
+        if (!chromiumBrowser.exists()) {
+            return new ChromeDriver(options);
+        }
+
+        // - https://www.selenium.dev/documentation/webdriver/drivers/service/#driver-location
+        // - https://github.com/SeleniumHQ/seleniumhq.github.io/blob/trunk/examples/java/src/test/java/dev/selenium/drivers/ServiceTest.java#L25-L26
+        var service = new ChromeDriverService.Builder()
+                .usingDriverExecutable(new File("/usr/bin/chromedriver"))
+                .build();
+        options.setBinary(chromiumBrowser);
+        return new ChromeDriver(service, options);
     }
 
     @AfterEach