diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3fc91fe1d3..6bd23d9613 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -230,10 +230,6 @@ stages:
 
 # Ubuntu
 
-.ubuntu-focal-amd64: &ubuntu_focal_amd64_image
-  image: "$CI_REGISTRY_IMAGE:ubuntu-focal-amd64"
-  <<: *linux_amd64
-
 .ubuntu-jammy-amd64: &ubuntu_jammy_amd64_image
   image: "$CI_REGISTRY_IMAGE:ubuntu-jammy-amd64"
   <<: *linux_amd64
@@ -1194,39 +1190,13 @@ unit:gcc:tumbleweed:amd64:
     - job: gcc:tumbleweed:amd64
       artifacts: true
 
-# Jobs for regular GCC builds on Ubuntu 20.04 Focal Fossa (amd64)
-
-gcc:focal:amd64:
-  variables:
-    CC: gcc
-    CFLAGS: "${CFLAGS_COMMON} -Og"
-    EXTRA_CONFIGURE: "--disable-dnstap --without-cmocka --without-gssapi --with-libidn2"
-  <<: *ubuntu_focal_amd64_image
-  <<: *build_job
-
-system:gcc:focal:amd64:
-  <<: *ubuntu_focal_amd64_image
-  <<: *system_test_job
-  <<: *api_pipelines_schedules_tags_triggers_web_triggering_rules
-  needs:
-    - job: gcc:focal:amd64
-      artifacts: true
-
-unit:gcc:focal:amd64:
-  <<: *ubuntu_focal_amd64_image
-  <<: *unit_test_job
-  <<: *api_pipelines_schedules_tags_triggers_web_triggering_rules
-  needs:
-    - job: gcc:focal:amd64
-      artifacts: true
-
 # Jobs for regular GCC builds on Ubuntu 22.04 Jammy Jellyfish (amd64)
 
 gcc:jammy:amd64:
   variables:
     CC: gcc
     CFLAGS: "${CFLAGS_COMMON}"
-    EXTRA_CONFIGURE: "--disable-geoip --with-libidn2 --disable-doh"
+    EXTRA_CONFIGURE: "--disable-geoip --with-libidn2 --disable-doh --disable-dnstap --without-cmocka --without-gssapi"
   <<: *ubuntu_jammy_amd64_image
   <<: *build_job
 
diff --git a/doc/arm/platforms.inc.rst b/doc/arm/platforms.inc.rst
index 03ce969462..fad14e89c7 100644
--- a/doc/arm/platforms.inc.rst
+++ b/doc/arm/platforms.inc.rst
@@ -44,7 +44,7 @@ Current versions of BIND 9 are fully supported and regularly tested on the
 following systems:
 
 -  Debian 12
--  Ubuntu LTS 20.04, 22.04, 24.04
+-  Ubuntu LTS 22.04, 24.04
 -  Fedora 42
 -  Red Hat Enterprise Linux / CentOS / Oracle Linux 8, 9
 -  FreeBSD 13.4, 14.2
@@ -87,7 +87,7 @@ supported platforms.
 
 -  Platforms past or close to their respective EOL dates, such as:
 
-   -  Ubuntu 14.04, 16.04, 18.04 (Ubuntu ESM releases are not supported)
+   -  Ubuntu 14.04, 16.04, 18.04, 20.04 (Ubuntu ESM releases are not supported)
    -  Red Hat Enterprise Linux / CentOS / Oracle Linux 6, 7
    -  Debian 8 Jessie, 9 Stretch, 10 Buster, 11 Bullseye
    -  FreeBSD 10.x, 11.x