diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51a17bc3d5e..b62c1d95f81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ Docs: https://docs.openclaw.ai
 - macOS Gateway: detect installed-but-unloaded LaunchAgent split-brain states during status, doctor, and restart, and re-bootstrap launchd supervision before falling back to unmanaged listener restarts. Fixes #67335, #53475, and #71060; refs #58890, #60885, and #70801. Thanks @ze1tgeist88, @dafacto, and @vishutdhar.
 - Plugins/install: stage bundled plugin runtime dependencies before Gateway startup, drain update restarts, and materialize plugin-owned root chunks in external mirrors so staged deps resolve under native ESM. Fixes #72058; supersedes #72084. Thanks @amnesia106 and @drvoss.
 - TTS/SecretRef: resolve `messages.tts.providers.*.apiKey` from the active runtime snapshot so SecretRef-backed MiniMax and other TTS provider keys work in runtime reply/audio paths. Fixes #68690. Thanks @joshavant.
+- Gateway/install: surface systemd user-bus recovery hints during Linux service activation and retry via the machine user scope when `systemctl --user` reports no-medium bus failures. Fixes #39673; refs #44417 and #63561. Thanks @Arbor4, @myrsu, and @mssteuer.
 - CLI/startup: read generated startup metadata from the bundled `dist` layout before falling back to live help rendering, so root/browser help and channel-option bootstrap stay on the fast path. Thanks @vincentkoc.
 - CLI/help: treat positional `help` invocations like `openclaw channels help` as help paths for startup gating, avoiding model/auth warmup while preserving positional arguments such as `openclaw docs help`. Thanks @gumadeiras.
 - Web search: route plugin-scoped web_search SecretRefs through the active runtime config snapshot so provider execution receives resolved credentials across app/runtime paths, including `plugins.entries.brave.config.webSearch.apiKey`. Fixes #68690. Thanks @VACInc.
diff --git a/src/cli/daemon-cli/response.ts b/src/cli/daemon-cli/response.ts
index fe77f1d00d7..e2ea3566974 100644
--- a/src/cli/daemon-cli/response.ts
+++ b/src/cli/daemon-cli/response.ts
@@ -1,5 +1,11 @@
 import { Writable } from "node:stream";
 import type { GatewayService } from "../../daemon/service.js";
+import {
+  isSystemdUnavailableDetail,
+  renderSystemdUnavailableHints,
+} from "../../daemon/systemd-hints.js";
+import { classifySystemdUnavailableDetail } from "../../daemon/systemd-unavailable.js";
+import { isWSL } from "../../infra/wsl.js";
 import { defaultRuntime } from "../../runtime.js";
 
 export type DaemonAction = "install" | "uninstall" | "start" | "stop" | "restart";
@@ -132,6 +138,17 @@ export function createDaemonActionContext(params: { action: DaemonAction; json:
   return { stdout, warnings, emit, fail };
 }
 
+async function buildInstallFailureHints(error: unknown): Promise<string[] | undefined> {
+  const detail = String(error);
+  if (process.platform !== "linux" || !isSystemdUnavailableDetail(detail)) {
+    return undefined;
+  }
+  return renderSystemdUnavailableHints({
+    wsl: await isWSL(),
+    kind: classifySystemdUnavailableDetail(detail),
+  });
+}
+
 export async function installDaemonServiceAndEmit(params: {
   serviceNoun: string;
   service: GatewayService;
@@ -143,7 +160,10 @@ export async function installDaemonServiceAndEmit(params: {
   try {
     await params.install();
   } catch (err) {
-    params.fail(`${params.serviceNoun} install failed: ${String(err)}`);
+    params.fail(
+      `${params.serviceNoun} install failed: ${String(err)}`,
+      await buildInstallFailureHints(err),
+    );
     return;
   }
 
diff --git a/src/daemon/systemd-hints.test.ts b/src/daemon/systemd-hints.test.ts
index 08aef124e58..02fa7c1cdad 100644
--- a/src/daemon/systemd-hints.test.ts
+++ b/src/daemon/systemd-hints.test.ts
@@ -7,6 +7,7 @@ describe("isSystemdUnavailableDetail", () => {
     expect(
       isSystemdUnavailableDetail("systemctl --user unavailable: Failed to connect to bus"),
     ).toBe(true);
+    expect(isSystemdUnavailableDetail("systemctl --user unavailable: ENOMEDIUM")).toBe(true);
     expect(
       isSystemdUnavailableDetail(
         "systemctl not available; systemd user services are required on Linux.",
diff --git a/src/daemon/systemd-unavailable.ts b/src/daemon/systemd-unavailable.ts
index 1ce3ef1a751..196e980cc46 100644
--- a/src/daemon/systemd-unavailable.ts
+++ b/src/daemon/systemd-unavailable.ts
@@ -27,6 +27,7 @@ export function isSystemdUserBusUnavailableDetail(detail?: string): boolean {
     normalized.includes("failed to connect to user scope bus") ||
     normalized.includes("dbus_session_bus_address") ||
     normalized.includes("xdg_runtime_dir") ||
+    normalized.includes("enomedium") ||
     normalized.includes("no medium found")
   );
 }
diff --git a/src/daemon/systemd.test.ts b/src/daemon/systemd.test.ts
index 4c53a81df88..110da192f60 100644
--- a/src/daemon/systemd.test.ts
+++ b/src/daemon/systemd.test.ts
@@ -862,6 +862,92 @@ describe("systemd service install and uninstall", () => {
     });
   });
 
+  it("falls back to machine user scope when install activation hits a no-medium user bus failure", async () => {
+    await withNodeSystemdFixture(async ({ env }) => {
+      const installEnv = { ...env, USER: "debian" };
+      execFileMock
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "status");
+          cb(null, "", "");
+        })
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "daemon-reload");
+          cb(null, "", "");
+        })
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "enable", NODE_SERVICE);
+          cb(
+            createExecFileError("Failed to connect to bus: No medium found", {
+              stderr: "Failed to connect to bus: No medium found",
+            }),
+            "",
+            "",
+          );
+        })
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertMachineUserSystemctlArgs(args, "debian", "enable", NODE_SERVICE);
+          cb(null, "", "");
+        })
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "restart", NODE_SERVICE);
+          cb(null, "", "");
+        });
+
+      await installSystemdService({
+        env: installEnv,
+        stdout: { write: vi.fn() } as unknown as NodeJS.WritableStream,
+        programArguments: ["/usr/bin/openclaw", "node", "run"],
+        workingDirectory: "/tmp",
+        environment: {
+          OPENCLAW_SYSTEMD_UNIT: "openclaw-node",
+        },
+      });
+
+      expect(execFileMock).toHaveBeenCalledTimes(5);
+    });
+  });
+
+  it("surfaces install activation user-bus failures as systemd unavailable errors", async () => {
+    await withNodeSystemdFixture(async ({ env }) => {
+      vi.spyOn(os, "userInfo").mockImplementation(() => {
+        throw new Error("no user info");
+      });
+      execFileMock
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "status");
+          cb(null, "", "");
+        })
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "daemon-reload");
+          cb(null, "", "");
+        })
+        .mockImplementationOnce((_cmd, args, _opts, cb) => {
+          assertUserSystemctlArgs(args, "enable", NODE_SERVICE);
+          cb(
+            createExecFileError("Failed to connect to bus: No medium found", {
+              stderr: "Failed to connect to bus: No medium found",
+            }),
+            "",
+            "",
+          );
+        });
+
+      await expect(
+        installSystemdService({
+          env,
+          stdout: { write: vi.fn() } as unknown as NodeJS.WritableStream,
+          programArguments: ["/usr/bin/openclaw", "node", "run"],
+          workingDirectory: "/tmp",
+          environment: {
+            OPENCLAW_SYSTEMD_UNIT: "openclaw-node",
+          },
+        }),
+      ).rejects.toThrow("systemctl --user unavailable: Failed to connect to bus: No medium found");
+
+      expect(execFileMock).toHaveBeenCalledTimes(3);
+    });
+  });
+
   it("disables the OPENCLAW_SYSTEMD_UNIT override during uninstall", async () => {
     await withNodeSystemdFixture(async ({ env, unitPath }) => {
       await fs.mkdir(path.dirname(unitPath), { recursive: true });
diff --git a/src/daemon/systemd.ts b/src/daemon/systemd.ts
index ad75ed6f599..26edba280e2 100644
--- a/src/daemon/systemd.ts
+++ b/src/daemon/systemd.ts
@@ -554,9 +554,19 @@ async function activateSystemdService(params: { env: GatewayServiceEnv }) {
   const serviceName = resolveSystemdServiceName(params.env);
   const unitName = `${serviceName}.service`;
   const reloadSystemd = async () => await execSystemctlUser(params.env, ["daemon-reload"]);
+  const throwActivationFailure = (
+    action: "daemon-reload" | "enable" | "restart",
+    result: { stdout: string; stderr: string },
+  ): never => {
+    const detail = readSystemctlDetail(result);
+    if (isSystemdUserScopeUnavailable(detail)) {
+      throw new Error(`systemctl --user unavailable: ${detail || "unknown error"}`.trim());
+    }
+    throw new Error(`systemctl ${action} failed: ${detail || "unknown error"}`.trim());
+  };
   const reload = await reloadSystemd();
   if (reload.code !== 0) {
-    throw new Error(`systemctl daemon-reload failed: ${reload.stderr || reload.stdout}`.trim());
+    throwActivationFailure("daemon-reload", reload);
   }
 
   const runAfterReloadRetry = async (action: "enable" | "restart") => {
@@ -566,21 +576,19 @@ async function activateSystemdService(params: { env: GatewayServiceEnv }) {
     }
     const retryReload = await reloadSystemd();
     if (retryReload.code !== 0) {
-      throw new Error(
-        `systemctl daemon-reload failed: ${retryReload.stderr || retryReload.stdout}`.trim(),
-      );
+      throwActivationFailure("daemon-reload", retryReload);
     }
     return await execSystemctlUser(params.env, [action, unitName]);
   };
 
   const enable = await runAfterReloadRetry("enable");
   if (enable.code !== 0) {
-    throw new Error(`systemctl enable failed: ${enable.stderr || enable.stdout}`.trim());
+    throwActivationFailure("enable", enable);
   }
 
   const restart = await runAfterReloadRetry("restart");
   if (restart.code !== 0) {
-    throw new Error(`systemctl restart failed: ${restart.stderr || restart.stdout}`.trim());
+    throwActivationFailure("restart", restart);
   }
 }