diff --git a/.github/workflows/event-merge-to-queue.yml b/.github/workflows/event-merge-to-queue.yml
index 3a8e53b3f..21b892137 100644
--- a/.github/workflows/event-merge-to-queue.yml
+++ b/.github/workflows/event-merge-to-queue.yml
@@ -11,8 +11,9 @@ jobs:
 
   jammy:
     uses: ./.github/workflows/jammy.yml
-  focal:
-    uses: ./.github/workflows/focal.yml
+# TODO: re-enable once Launchpad PPA flakiness is resolved (pre-built CI image planned).
+#  focal:
+#    uses: ./.github/workflows/focal.yml
 #  bionic:
 #    needs: [check-if-docs-only]
 #    if: ${{ needs.check-if-docs-only.outputs.only-docs-changed == 'false' }}
@@ -46,7 +47,7 @@ jobs:
   pr-validation:
     needs:
       - jammy
-      - focal
+#      - focal
 #      - bionic
       - bullseye
 #      - amazonlinux2
diff --git a/.github/workflows/event-nightly.yml b/.github/workflows/event-nightly.yml
index 88ecc624e..dbb66624c 100644
--- a/.github/workflows/event-nightly.yml
+++ b/.github/workflows/event-nightly.yml
@@ -14,8 +14,9 @@ jobs:
 
   jammy:
     uses: ./.github/workflows/jammy.yml
-  focal:
-    uses: ./.github/workflows/focal.yml
+  # TODO: re-enable once Launchpad PPA flakiness is resolved (pre-built CI image planned).
+  #  focal:
+  #    uses: ./.github/workflows/focal.yml
   #  bionic:
   #    needs: [check-if-docs-only]
   #    if: ${{ needs.check-if-docs-only.outputs.only-docs-changed == 'false' }}
@@ -53,7 +54,7 @@ jobs:
     needs:
       - benchmark
       - jammy
-      - focal
+#      - focal
 #      - bionic
       - bullseye
 #      - amazonlinux2