better heuristic to find mount error

src/volumes.js

@@ -161,17 +161,20 @@ async function getStatus(volume) {
 
     let output = safe.child_process.execSync(`systemctl show --value -p ActiveState $(systemd-escape -p --suffix=mount ${volume.hostPath})`, { encoding: 'utf8' });
     let state = output ? output.trim() : '';
-    let message = 'Mounted';
+    let message;
 
     if (state !== 'active') { // find why it failed
         output = safe.child_process.execSync(`journalctl -u $(systemd-escape -p --suffix=mount ${volume.hostPath}) -n 10 --no-pager -o cat`, { encoding: 'utf8' });
 
-        if (!output) {
-            message = `Could not determine failure reason: ${safe.error.message}`;
-        } else {
-            message = output.split('\n').reverse().find(l => l.startsWith('mount.'));
+        if (output) {
+            const idx = output.split('\n').reverse().findIndex(l => l.includes('process exited'));
+            if (idx > 0) message = output[idx-1]; // the line before probably has the error
         }
+        if (!message) message = `Could not determine failure reason: ${safe.error.message}`;
+    } else {
+        message = 'Mounted';
     }
+
     return { state, message };
 }