diff --git a/.github/workflows/l10n.yml b/.github/workflows/l10n.yml
index 98504f997..11b2c52e7 100644
--- a/.github/workflows/l10n.yml
+++ b/.github/workflows/l10n.yml
@@ -56,6 +56,18 @@ jobs:
           ubuntu-*)
             # selinux headers needed for testing
             sudo apt-get -y update ; sudo apt-get -y install libselinux1-dev
+            # Locales required by tests/by-util/test_date.rs and
+            # tests/by-util/test_dd.rs (fr_FR is the ISO-8859-1 variant
+            # used by test_iso8859_1_case_conversion).
+            sudo locale-gen --keep-existing fr_FR
+            sudo locale-gen --keep-existing fr_FR.UTF-8
+            sudo locale-gen --keep-existing es_ES.UTF-8
+            sudo locale-gen --keep-existing en_US.UTF-8
+            sudo locale-gen --keep-existing fa_IR.UTF-8 # Iran
+            sudo locale-gen --keep-existing am_ET.UTF-8 # Ethiopia
+            sudo locale-gen --keep-existing th_TH.UTF-8 # Thailand
+            sudo locale-gen --keep-existing hu_HU.UTF-8 # Hungary
+            sudo update-locale
           ;;
           macos-*)
             # needed for testing
diff --git a/tests/by-util/test_date.rs b/tests/by-util/test_date.rs
index 489f15158..7096e2040 100644
--- a/tests/by-util/test_date.rs
+++ b/tests/by-util/test_date.rs
@@ -3,7 +3,7 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 //
-// spell-checker: ignore: AEDT AEST EEST NZDT NZST Kolkata Iseconds févr février janv janvier mercredi samedi sommes juin décembre Januar Juni Dezember enero junio diciembre gennaio giugno dicembre junho dezembro lundi dimanche Montag Sonntag Samstag sábado febr MEST KST uueuu ueuu
+// spell-checker: ignore: AEDT AEST EEST NZDT NZST Kolkata Iseconds févr février janv janvier mercredi samedi sommes juin décembre Januar Juni Dezember enero junio diciembre gennaio giugno dicembre junho dezembro lundi dimanche Montag Sonntag Samstag sábado febr MEST KST uueuu ueuu vasárnap június január distros
 // spell-checker: ignore: uppercases
 
 use std::cmp::Ordering;