diff --git a/README.md b/README.md
index 0406c29ce..982827e79 100644
--- a/README.md
+++ b/README.md
@@ -74,7 +74,7 @@ Support us with a monthly donation and help us continue our activities. [[Become
 
 A fresh VM running any of the following operating systems:
 
-- Ubuntu 20.04 / 22.04 / 24.04 (amd64/arm64) - Any currently supported release
+- Ubuntu 22.04 / 24.04 (amd64/arm64) - Any currently supported release
 - Debian 11+ (amd64/arm64)
 
 An SSH keypair that can be used for application deployment. If this exists before installation, it will be automatically imported into dokku.
diff --git a/bootstrap.sh b/bootstrap.sh
index 21b65d3c1..8386c182f 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -3,7 +3,7 @@ set -eo pipefail
 [[ $TRACE ]] && set -x
 
 # A script to bootstrap dokku.
-# It expects to be run on Ubuntu 20.04/22.04/24.04 via 'sudo`
+# It expects to be run on Ubuntu 22.04/24.04 via 'sudo`
 # If installing a tag higher than 0.3.13, it may install dokku via a package (so long as the package is higher than 0.3.13)
 # It checks out the dokku source code from GitHub into ~/dokku and then runs 'make install' from dokku source.
 
@@ -12,7 +12,7 @@ set -eo pipefail
 # That's good because it prevents our output overlapping with wget's.
 # It also means that we can't run a partially downloaded script.
 
-SUPPORTED_VERSIONS="Debian [11, 12], Ubuntu [20.04, 22.04, 24.04]"
+SUPPORTED_VERSIONS="Debian [11, 12], Ubuntu [22.04, 24.04]"
 
 log-fail() {
   declare desc="log fail formatter"
@@ -160,7 +160,7 @@ install-dokku-from-deb-package() {
   local NO_INSTALL_RECOMMENDS=${DOKKU_NO_INSTALL_RECOMMENDS:=""}
   local OS_ID
 
-  if ! in-array "$DOKKU_DISTRO_VERSION" "20.04" "22.04" "24.04" "10" "11" "12"; then
+  if ! in-array "$DOKKU_DISTRO_VERSION" "22.04" "24.04" "10" "11" "12"; then
     log-fail "Unsupported Linux distribution. Only the following versions are supported: $SUPPORTED_VERSIONS"
   fi
 
@@ -188,7 +188,7 @@ install-dokku-from-deb-package() {
   fi
 
   if [[ "$DOKKU_DISTRO" == "ubuntu" ]]; then
-    OS_IDS=("focal" "jammy" "noble")
+    OS_IDS=("jammy" "noble")
     if ! in-array "$OS_ID" "${OS_IDS[@]}"; then
       OS_ID="noble"
     fi
diff --git a/contrib/release-dokku b/contrib/release-dokku
index f71c39ee0..9b114fbcb 100755
--- a/contrib/release-dokku
+++ b/contrib/release-dokku
@@ -144,7 +144,7 @@ fn-publish-package() {
       fi
     done
   elif [[ "$DIST" == "ubuntu" ]]; then
-    OS_IDS=("focal" "jammy" "noble")
+    OS_IDS=("jammy" "noble")
     for OS_ID in "${OS_IDS[@]}"; do
       log-info "(release-dokku) pushing ${RELEASE_TYPE} to packagecloud.com/${REPOSITORY}/${DIST}"
       package_cloud push "${REPOSITORY}/${DIST}/${OS_ID}" "$PACKAGE_NAME"
diff --git a/docs/appendices/0.36.0-migration-guide.md b/docs/appendices/0.36.0-migration-guide.md
index 54f9b17eb..2caeca288 100644
--- a/docs/appendices/0.36.0-migration-guide.md
+++ b/docs/appendices/0.36.0-migration-guide.md
@@ -6,3 +6,7 @@
 - Processes now default to a `30` second stop timeout.
 - The `domains:clear` command no longer runs domain setup after clearing the domains. Use `domains:reset` or run `domains:setup` manually to have the same effect.
 - The deprecated `DOKKU_DISABLE_ANSI_PREFIX_REMOVAL` setting has been removed. Dokku deploys no longer use shell escape codes to modify output, and thus deploy output may now contain `remote:` as a prefix in each lines output.
+
+## Deprecations
+
+Ubuntu 20.04 is now a deprecated installation target. The operating system will be considered EOL by Canonical in April 2025. Users are encouraged to upgrade to Ubuntu 24.04 or consider switching their instllation method to the [Docker-based installation method](/docs/getting-started/install/docker.md) to avoid any disruption in usage.
diff --git a/docs/development/testing.md b/docs/development/testing.md
index 669449a24..1daaca2be 100644
--- a/docs/development/testing.md
+++ b/docs/development/testing.md
@@ -13,7 +13,7 @@ All pull requests have tests run against them on [GitHub Actions](https://github
 
 If you wish to skip tests for a particular commit, e.g. documentation changes, you may add the `[ci skip]` designator to your commit message. Commits that _should_ be tested but have the above designator will not be merged.
 
-While we do provide official packages for a variety of platforms, as our test suite currently runs on Ubuntu Noble 24.04, we only provide official installation support for that platform and the supported LTS releases of Ubuntu (currently 20.04, 22.04, and 24.04).
+While we do provide official packages for a variety of platforms, as our test suite currently runs on Ubuntu Noble 24.04, we only provide official installation support for that platform and the supported LTS releases of Ubuntu (currently 22.04, and 24.04).
 
 ## Local Test Execution
 
diff --git a/docs/getting-started/installation/index.md b/docs/getting-started/installation/index.md
index babdf8525..b872ee6c0 100644
--- a/docs/getting-started/installation/index.md
+++ b/docs/getting-started/installation/index.md
@@ -9,7 +9,7 @@ Dokku is an extensible, open source Platform as a Service that runs on a single
 To start using Dokku, you'll need a system that meets the following minimum requirements:
 
 - A fresh installation of any of the following operating systems:
-    - [Ubuntu 20.04/22.04/24.04](https://www.ubuntu.com/download)
+    - [Ubuntu 22.04/24.04](https://www.ubuntu.com/download)
     - [Debian 11+ x64](https://www.debian.org/distrib/)
 - A server with one of the following architectures
     - AMD64 (alternatively known as `x86_64`), commonly used for Intel cloud servers