From 1d46401b070270cb3185201465c208b70f678fc0 Mon Sep 17 00:00:00 2001
From: Luca Toniolo <10792599+grandixximo@users.noreply.github.com>
Date: Tue, 4 Aug 2026 07:52:24 +0800
Subject: [PATCH] CI: Use main Ubuntu archive instead of
 azure.archive.ubuntu.com

The azure.archive.ubuntu.com apt mirror on GitHub-hosted runners
regularly degrades to trickle speeds for extended periods, stalling
package downloads until the job hits its timeout. This is a recurring
upstream problem, see actions/runner-images issues #7048 and #12949.
apt retries do not help because the connection stays alive, only slow.

Switch affected jobs to archive.ubuntu.com, which is consistently fast
from Azure.
---
 .github/scripts/install-deps.sh           |  2 ++
 .github/scripts/use-main-ubuntu-mirror.sh | 15 +++++++++++++++
 .github/workflows/ci.yml                  |  1 +
 3 files changed, 18 insertions(+)
 create mode 100755 .github/scripts/use-main-ubuntu-mirror.sh

diff --git a/.github/scripts/install-deps.sh b/.github/scripts/install-deps.sh
index dee1d5084b3..174c7a9558e 100755
--- a/.github/scripts/install-deps.sh
+++ b/.github/scripts/install-deps.sh
@@ -3,6 +3,8 @@
 set -eu #Needed so CI fails when anything is wrong
 set -x
 
+.github/scripts/use-main-ubuntu-mirror.sh
+
 sudo apt-get --quiet update
 sudo apt-get install --yes --no-install-recommends devscripts equivs build-essential lintian clang
 debian/configure
diff --git a/.github/scripts/use-main-ubuntu-mirror.sh b/.github/scripts/use-main-ubuntu-mirror.sh
new file mode 100755
index 00000000000..8a5d12efbaa
--- /dev/null
+++ b/.github/scripts/use-main-ubuntu-mirror.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# The azure.archive.ubuntu.com apt mirror on GitHub-hosted runners
+# regularly degrades to trickle speeds for extended periods, which stalls
+# package downloads until the job hits its timeout. apt retries do not
+# help because the connection stays alive, only slow. Switch to the main
+# Ubuntu archive, which is consistently fast from Azure.
+
+set -eu #Needed so CI fails when anything is wrong
+set -x
+
+for f in /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; do
+    [ -e "$f" ] || continue
+    sudo sed -i 's|http://azure\.archive\.ubuntu\.com/ubuntu|http://archive.ubuntu.com/ubuntu|g' "$f"
+done
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6035eb6289c..c1d9c9a1430 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -131,6 +131,7 @@ jobs:
     - name: Install dependencies
       run: |
         set -x
+        .github/scripts/use-main-ubuntu-mirror.sh
         sudo apt-get -q update
         sudo apt-get --yes install cppcheck
     - name: Cppcheck