diff --git a/develop/develop-images/build_enhancements.md b/develop/develop-images/build_enhancements.md
index a5b0750793..ee679509b5 100644
--- a/develop/develop-images/build_enhancements.md
+++ b/develop/develop-images/build_enhancements.md
@@ -24,14 +24,12 @@ For more information on build options, see the reference guide on the
 
 ## Requirements
 
-* System requirements are docker-ce x86_64, ppc64le, s390x, aarch64, armhf; or
-  docker-ee x86_64 only
+* A current version of Docker (18.09 or higher)
 * Network connection required for downloading images of custom frontends 
 
 ## Limitations
 
 * Only supported for building Linux containers
-* BuildKit mode is compatible with UCP 3.2 or newer
 
 ## To enable BuildKit builds
 
@@ -184,7 +182,8 @@ $ docker build --no-cache --progress=plain --secret id=mysecret,src=mysecret.txt
 
 ## Using SSH to access private data in builds
 
-> **Acknowledgment**:
+> **Acknowledgment**
+>
 > Please see [Build secrets and SSH forwarding in Docker 18.09](https://medium.com/@tonistiigi/build-secrets-and-ssh-forwarding-in-docker-18-09-ae8161d066)
 > for more information and examples.
 
diff --git a/engine/install/index.md b/engine/install/index.md
index b767a86d4e..8ff5dee203 100644
--- a/engine/install/index.md
+++ b/engine/install/index.md
@@ -39,13 +39,13 @@ your preferred operating system below.
 Docker provides `.deb` and `.rpm` packages from the following Linux distributions
 and architectures:
 
-| Platform              | x86_64 / amd64         | ARM                      | ARM64 / AARCH64        | IBM Power (ppc64le)    | IBM Z (s390x)          |
-|:----------------------|:-----------------------|:-------------------------|:-----------------------|:-----------------------|:-----------------------|
-| [CentOS](centos.md)   | [{{ yes }}](centos.md) |                          | [{{ yes }}](centos.md) |                        |                        |
-| [Debian](debian.md)   | [{{ yes }}](debian.md) | [{{ yes }}](debian.md)   | [{{ yes }}](debian.md) |                        |                        |
-| [Fedora](fedora.md)   | [{{ yes }}](fedora.md) |                          | [{{ yes }}](fedora.md) |                        |                        |
-| [Raspbian](debian.md) |                        | [{{ yes }}](debian.md)   | [{{ yes }}](debian.md) |                        |                        |
-| [Ubuntu](ubuntu.md)   | [{{ yes }}](ubuntu.md) | [{{ yes }}](ubuntu.md)   | [{{ yes }}](ubuntu.md) | [{{ yes }}](ubuntu.md) | [{{ yes }}](ubuntu.md) |
+| Platform              | x86_64 / amd64         | ARM                      | ARM64 / AARCH64        |
+|:----------------------|:-----------------------|:-------------------------|:-----------------------|
+| [CentOS](centos.md)   | [{{ yes }}](centos.md) |                          | [{{ yes }}](centos.md) |
+| [Debian](debian.md)   | [{{ yes }}](debian.md) | [{{ yes }}](debian.md)   | [{{ yes }}](debian.md) |
+| [Fedora](fedora.md)   | [{{ yes }}](fedora.md) |                          | [{{ yes }}](fedora.md) |
+| [Raspbian](debian.md) |                        | [{{ yes }}](debian.md)   | [{{ yes }}](debian.md) |
+| [Ubuntu](ubuntu.md)   | [{{ yes }}](ubuntu.md) | [{{ yes }}](ubuntu.md)   | [{{ yes }}](ubuntu.md) |
 
 ##### Other Linux distributions
 
diff --git a/engine/install/ubuntu.md b/engine/install/ubuntu.md
index ce6c8a877b..4374a18057 100644
--- a/engine/install/ubuntu.md
+++ b/engine/install/ubuntu.md
@@ -29,8 +29,7 @@ versions:
 - Ubuntu Bionic 18.04 (LTS)
 - Ubuntu Xenial 16.04 (LTS)
 
-Docker Engine is supported on `x86_64` (or `amd64`), `armhf`, `arm64`, `s390x`
-(IBM Z), and `ppc64le` (IBM Power) architectures.
+Docker Engine is supported on `x86_64` (or `amd64`), `armhf`, and `arm64` architectures.
 
 ### Uninstall old versions
 
@@ -129,8 +128,6 @@ from the repository.
       <li class="active"><a data-toggle="tab" data-target="#x86_64_repo">x86_64 / amd64</a></li>
       <li><a data-toggle="tab" data-target="#armhf_repo">armhf</a></li>
       <li><a data-toggle="tab" data-target="#arm64_repo">arm64</a></li>
-      <li><a data-toggle="tab" data-target="#ppc64le_repo">ppc64le (IBM Power)</a></li>
-      <li><a data-toggle="tab" data-target="#s390x_repo">s390x (IBM Z)</a></li>
     </ul>
     <div class="tab-content">
     <div id="x86_64_repo" class="tab-pane fade in active" markdown="1">
@@ -162,26 +159,6 @@ from the repository.
        stable"
     ```
 
-    </div>
-    <div id="ppc64le_repo" class="tab-pane fade" markdown="1">
-
-    ```bash
-    $ sudo add-apt-repository \
-       "deb [arch=ppc64el] {{ download-url-base }} \
-       $(lsb_release -cs) \
-       stable"
-    ```
-
-    </div>
-    <div id="s390x_repo" class="tab-pane fade" markdown="1">
-
-    ```bash
-    $ sudo add-apt-repository \
-       "deb [arch=s390x] {{ download-url-base }} \
-       $(lsb_release -cs) \
-       stable"
-    ```
-
     </div>
     </div> <!-- tab-content -->
 
@@ -253,7 +230,7 @@ a new file each time you want to upgrade Docker.
 
 1.  Go to [`{{ download-url-base }}/dists/`]({{ download-url-base }}/dists/){: target="_blank" class="_" },
     choose your Ubuntu version, then browse to `pool/stable/`, choose `amd64`,
-    `armhf`, `arm64`, `ppc64el`, or `s390x`, and download the `.deb` file for the
+    `armhf`, or `arm64`, and download the `.deb` file for the
     Docker Engine version you want to install.
 
     > **Note**: To install a **nightly** or **test** (pre-release) package,