diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index dcfe975..035b1ec 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -310,6 +310,14 @@ jobs:
               ps -C apt-get,dpkg,http,https,gpgv,store -o pid,etime,args || true
               [ "$try" -lt 3 ] || break
               sudo timeout 60 dpkg --configure -a || true
+              # The Azure mirror can be slow for hours (#101): the next try
+              # takes the next mirror and resumes the partial downloads
+              M=/etc/apt/apt-mirrors.txt
+              if grep -q 'azure\.archive' "$M" 2>/dev/null &&
+                 [ "$(grep -v 'azure\.archive' "$M" | grep -c '://')" -gt 0 ]; then
+                sudo sed -i '/azure\.archive/d' "$M"
+                echo "apt mirrors now:"; cat "$M"
+              fi
               sleep 10
             done
             return 1
@@ -399,6 +407,14 @@ jobs:
               ps -C apt-get,dpkg,http,https,gpgv,store -o pid,etime,args || true
               [ "$try" -lt 3 ] || break
               sudo timeout 60 dpkg --configure -a || true
+              # The Azure mirror can be slow for hours (#101): the next try
+              # takes the next mirror and resumes the partial downloads
+              M=/etc/apt/apt-mirrors.txt
+              if grep -q 'azure\.archive' "$M" 2>/dev/null &&
+                 [ "$(grep -v 'azure\.archive' "$M" | grep -c '://')" -gt 0 ]; then
+                sudo sed -i '/azure\.archive/d' "$M"
+                echo "apt mirrors now:"; cat "$M"
+              fi
               sleep 10
             done
             return 1