diff --git a/backend/services/maintenance.py b/backend/services/maintenance.py
index 98f44d1..b00aed9 100644
--- a/backend/services/maintenance.py
+++ b/backend/services/maintenance.py
@@ -66,8 +66,10 @@ def _ram_gb() -> float:
 
 def _os_upgradable() -> int:
     try:
+        # LC_ALL=C erzwingt englische apt-Ausgabe ("[upgradable from: ...]") — sonst zählt
+        # grep auf einer deutschen Box ("[aktualisierbar von:]") nichts und meldet faelschlich 0.
         out = subprocess.run(
-            ["bash", "-c", "apt list --upgradable 2>/dev/null | grep -c upgradable || true"],
+            ["bash", "-c", "LC_ALL=C apt list --upgradable 2>/dev/null | grep -c upgradable || true"],
             capture_output=True, text=True, timeout=10)
         return int((out.stdout or "0").strip() or 0)
     except Exception:
@@ -296,7 +298,9 @@ def os_update_details() -> dict:
     """Liste der aktualisierbaren apt-Pakete (Name, installiert → Kandidat)."""
     out_pkgs: list[dict] = []
     try:
-        out = subprocess.run(["bash", "-c", "apt list --upgradable 2>/dev/null"],
+        # LC_ALL=C → englische Ausgabe, damit der Regex "[upgradable from: ...]" greift
+        # (deutsche Box meldet sonst "[aktualisierbar von:]" und die Liste bliebe leer).
+        out = subprocess.run(["bash", "-c", "LC_ALL=C apt list --upgradable 2>/dev/null"],
                              capture_output=True, text=True, timeout=20)
         for line in (out.stdout or "").splitlines():
             # Format: name/repo  neue_version  arch  [upgradable from: alte_version]