Merge branch 'helm3_docs'

docs/troubleshooting.md

@@ -160,9 +160,9 @@ on the VPS:
 
 * `kubectl`, the Kubernetes control program. The root user is connected to the
   cluster automatically.
-* `helm` is the "Kubernetes package manager". Use `helm ls` to see what apps are
-  installed in your cluster. You can also use it to perform manual upgrades;
-  see `helm --help`.
+* `helm` is the "Kubernetes package manager". Use i.e. `helm ls --all-namespaces`
+  to see what apps are installed in your cluster. You can also use it to perform
+  manual upgrades; see `helm --help`.
 
 ## Using kubectl to debug your cluster
 
@@ -256,7 +256,7 @@ could get fetched:
 
 Find applications that fail to install:
 
-    helm ls --all | grep -i -v DEPLOYED
+    helm ls --all-namespaces | grep -i -v DEPLOYED
     kubectl get helmreleases --all-namespaces | grep -i -v DEPLOYED
 
 Especially the nextcloud installation process is brittle and error-prone.