diff --git a/build.py b/build.py
index cdca16645..5be59503c 100755
--- a/build.py
+++ b/build.py
@@ -71,7 +71,7 @@ def make_parser():
     parser.add_argument(
         '--hwcodec',
         action='store_true',
-        help='Enable feature hwcodec, windows only.'
+        help='Enable feature hwcodec'
     )
     return parser
 
@@ -124,26 +124,28 @@ def get_features(args):
 
 def build_flutter_deb(version):
     os.chdir('flutter')
+    os.system('/bin/rm -rf tmpdeb/')
     os.system('dpkg-deb -R rustdesk.deb tmpdeb')
-    # os.system('flutter build linux --release')
+    os.system('flutter build linux --release')
     os.system('rm tmpdeb/usr/bin/rustdesk')
-    os.system('strip build/linux/x64/release/liblibrustdesk.so')
     os.system('mkdir -p tmpdeb/usr/lib/rustdesk')
     os.system('mkdir -p tmpdeb/usr/share/rustdesk/files/systemd/')
+    os.system('mkdir -p tmpdeb/usr/share/polkit-1/actions')
     os.system(
         'cp -r build/linux/x64/release/bundle/* tmpdeb/usr/lib/rustdesk/')
     os.system(
         'pushd tmpdeb && ln -s /usr/lib/rustdesk/flutter_hbb usr/bin/rustdesk && popd')
     os.system(
-        'cp build/linux/x64/release/liblibrustdesk.so tmpdeb/usr/lib/rustdesk/librustdesk.so')
+        'cp ../rustdesk.service tmpdeb/usr/share/rustdesk/files/systemd/')
     os.system(
-        'cp rustdesk.service tmpdeb/usr/share/rustdesk/files/systemd/')
-    os.system(
-        'cp rustdesk.service.user tmpdeb/usr/share/rustdesk/files/systemd/')
+        'cp ../rustdesk.service.user tmpdeb/usr/share/rustdesk/files/systemd/')
     os.system(
         'cp ../128x128@2x.png tmpdeb/usr/share/rustdesk/files/rustdesk.png')
     os.system(
-        'cp rustdesk.desktop tmpdeb/usr/share/applications/rustdesk.desktop')
+        'cp ../rustdesk.desktop tmpdeb/usr/share/applications/rustdesk.desktop')
+    os.system(
+        'cp ../com.rustdesk.RustDesk.policy tmpdeb/usr/share/polkit-1/actions/')
+    os.system("echo \"#!/bin/sh\" >> tmpdeb/usr/share/rustdesk/files/polkit && chmod a+x tmpdeb/usr/share/rustdesk/files/polkit")
     os.system('mkdir -p tmpdeb/DEBIAN')
     os.system('cp -a ../DEBIAN/* tmpdeb/DEBIAN/')
     md5_file('usr/share/rustdesk/files/systemd/rustdesk.service')
diff --git a/com.rustdesk.RustDesk.policy b/com.rustdesk.RustDesk.policy
new file mode 100644
index 000000000..a77223120
--- /dev/null
+++ b/com.rustdesk.RustDesk.policy
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policyconfig PUBLIC
+ "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
+<policyconfig>
+  <vendor>RustDesk</vendor>
+  <vendor_url>https://rustdesk.com/</vendor_url>
+  <icon_name>rustdesk</icon_name>
+  <action id="com.rustdesk.RustDesk.options">
+    <description>Change RustDesk options</description>
+    <message>Authentication is required to change RustDesk options</message>
+    <message xml:lang="zh_CN">要更改RustDesk选项, 需要您先通过身份验证</message>
+    <message xml:lang="zh_TW">要變更RustDesk選項, 需要您先通過身份驗證</message>
+    <annotate key="org.freedesktop.policykit.exec.path">/usr/share/rustdesk/files/polkit</annotate>
+    <annotate key="org.freedesktop.policykit.exec.allow_gui">true</annotate>
+    <defaults>
+      <allow_any>auth_admin</allow_any>
+      <allow_inactive>auth_admin</allow_inactive>
+      <allow_active>auth_admin</allow_active>
+    </defaults>
+  </action>
+</policyconfig>
diff --git a/flutter/lib/desktop/pages/desktop_setting_page.dart b/flutter/lib/desktop/pages/desktop_setting_page.dart
index 9aae9dc29..effc26b39 100644
--- a/flutter/lib/desktop/pages/desktop_setting_page.dart
+++ b/flutter/lib/desktop/pages/desktop_setting_page.dart
@@ -265,22 +265,14 @@ class _GeneralState extends State<_General> {
       if (devices.isEmpty) {
         return const Offstage();
       }
-      List<String> keys = devices.toList();
-      List<String> values = devices.toList();
-      // TODO
-      if (!devices.contains(currentDevice)) {
-        currentDevice = "";
-        keys.insert(0, currentDevice);
-        values.insert(0, 'default');
-      }
       return _Card(title: 'Audio Input Device', children: [
-        _ComboBox(
-            keys: keys,
-            values: values,
-            initialKey: currentDevice,
-            onChanged: (key) {
-              setDevice(key);
-            }).marginOnly(left: _kContentHMargin),
+        ...devices.map((device) => _Radio<String>(context,
+                value: device,
+                groupValue: currentDevice,
+                label: device, onChanged: (value) {
+              setDevice(value);
+              setState(() {});
+            }))
       ]);
     });
   }
@@ -876,6 +868,8 @@ Widget _Radio<T>(BuildContext context,
         Radio<T>(value: value, groupValue: groupValue, onChanged: onChange),
         Expanded(
           child: Text(translate(label),
+                  maxLines: 1,
+                  overflow: TextOverflow.ellipsis,
                   style: TextStyle(
                       fontSize: _kContentFontSize,
                       color: _disabledTextColor(context, enabled)))
diff --git a/src/platform/linux.rs b/src/platform/linux.rs
index fe2673832..89e2d296d 100644
--- a/src/platform/linux.rs
+++ b/src/platform/linux.rs
@@ -638,7 +638,13 @@ pub fn quit_gui() {
 }
 
 pub fn check_super_user_permission() -> ResultType<bool> {
-    // TODO: replace echo with a rustdesk's program, which is location-fixed and non-gui.
-    let status = std::process::Command::new("pkexec").arg("echo").status()?;
+    let file = "/usr/share/rustdesk/files/polkit";
+    let arg;
+    if std::path::Path::new(file).is_file() {
+        arg = file;
+    } else {
+        arg = "echo";
+    }
+    let status = std::process::Command::new("pkexec").arg(arg).status()?;
     Ok(status.success() && status.code() == Some(0))
 }