diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index b5e50fa..6a69a66 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -39,9 +39,6 @@
         <activity
             android:name=".ui.settings.UISettingsActivity"
             android:theme="@style/Theme.AppCompat" />
-        <activity
-            android:name=".ui.settings.PackageSettingsActivity"
-            android:theme="@style/Theme.AppCompat" />
 
         <service
             android:name=".services.NeoTermService"
diff --git a/app/src/main/assets/font.ttf b/app/src/main/assets/font.ttf
index 32f856a..f964ec0 100644
Binary files a/app/src/main/assets/font.ttf and b/app/src/main/assets/font.ttf differ
diff --git a/app/src/main/java/io/neoterm/customize/NeoTermPath.kt b/app/src/main/java/io/neoterm/customize/NeoTermPath.kt
index 2b10657..2fe8432 100644
--- a/app/src/main/java/io/neoterm/customize/NeoTermPath.kt
+++ b/app/src/main/java/io/neoterm/customize/NeoTermPath.kt
@@ -1,6 +1,7 @@
 package io.neoterm.customize
 
 import android.annotation.SuppressLint
+import io.neoterm.BuildConfig
 
 /**
  * @author kiva
@@ -17,11 +18,16 @@ object NeoTermPath {
     const val SOURCE_FILE = "$USR_PATH/etc/apt/sources.list"
     const val PACKAGE_LIST_DIR = "$USR_PATH/var/lib/apt/lists"
 
-    const val DEFAULT_SOURCE = "https://mirrors.geekpie.org/neoterm"
-    const val SERVER_BASE_URL = DEFAULT_SOURCE
-    const val SERVER_BOOT_URL = "$SERVER_BASE_URL/boot"
+    private const val RELEASE_SOURCE = "https://mirrors.geekpie.org/neoterm"
+    private const val DEBUG_SOURCE = "http://192.243.117.135"
 
-    const val DEBUG_SOURCE = "http://192.243.117.135"
-    const val DEBUG_SERVER = DEBUG_SOURCE
-    const val DEBUG_SERVER_BOOT_URL = "$DEBUG_SERVER/boot"
+    val DEFAULT_SOURCE: String
+    val SERVER_BASE_URL: String
+    val SERVER_BOOT_URL: String
+
+    init {
+        DEFAULT_SOURCE = if (BuildConfig.DEBUG) DEBUG_SOURCE else RELEASE_SOURCE
+        SERVER_BASE_URL = DEFAULT_SOURCE
+        SERVER_BOOT_URL = "$SERVER_BASE_URL/boot"
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/customize/font/FontManager.kt b/app/src/main/java/io/neoterm/customize/font/FontManager.kt
index 1421657..bb001b9 100644
--- a/app/src/main/java/io/neoterm/customize/font/FontManager.kt
+++ b/app/src/main/java/io/neoterm/customize/font/FontManager.kt
@@ -7,13 +7,17 @@ import android.graphics.Typeface
  * @author kiva
  */
 object FontManager {
-    private var DEFAULT_FONT: Typeface? = null
+    private lateinit var DEFAULT_FONT: Typeface
 
     fun init(context: Context) {
         DEFAULT_FONT = Typeface.createFromAsset(context.assets, "font.ttf")
     }
 
     fun getDefaultFont(): Typeface {
-        return DEFAULT_FONT!!
+        return DEFAULT_FONT
+    }
+
+    fun getCurrentFont(): Typeface {
+        return DEFAULT_FONT
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/customize/setup/BaseFileInstaller.java b/app/src/main/java/io/neoterm/customize/setup/BaseFileInstaller.java
index 58d5762..2d4f819 100644
--- a/app/src/main/java/io/neoterm/customize/setup/BaseFileInstaller.java
+++ b/app/src/main/java/io/neoterm/customize/setup/BaseFileInstaller.java
@@ -79,7 +79,6 @@ public final class BaseFileInstaller {
                                 public void run() {
                                     try {
                                         double progressFloat = ((double) totalReadBytesFinal) / ((double) totalBytesFinal) * 100.0;
-                                        Log.e("NeoTerm-Installer", "total: " + totalBytesFinal + ", read: " + totalReadBytesFinal + ", " + progressFloat);
                                         progress.setProgress((int) progressFloat);
                                     } catch (RuntimeException ignore) {
                                         // activity dismissed
@@ -191,7 +190,7 @@ public final class BaseFileInstaller {
 
     private static URL determineZipUrl() throws MalformedURLException {
         String archName = determineArchName();
-        String baseUrl = BuildConfig.DEBUG ? NeoTermPath.DEBUG_SERVER_BOOT_URL : NeoTermPath.SERVER_BOOT_URL;
+        String baseUrl = NeoTermPath.INSTANCE.getSERVER_BOOT_URL();
         return new URL(baseUrl + "/" + archName + ".zip");
     }
 
diff --git a/app/src/main/java/io/neoterm/ui/pm/PackageManagerActivity.kt b/app/src/main/java/io/neoterm/ui/pm/PackageManagerActivity.kt
index 08e33d2..b6bddcf 100644
--- a/app/src/main/java/io/neoterm/ui/pm/PackageManagerActivity.kt
+++ b/app/src/main/java/io/neoterm/ui/pm/PackageManagerActivity.kt
@@ -3,6 +3,7 @@ package io.neoterm.ui.pm
 import android.animation.Animator
 import android.animation.AnimatorListenerAdapter
 import android.animation.ObjectAnimator
+import android.annotation.SuppressLint
 import android.content.DialogInterface
 import android.os.Bundle
 import android.support.v4.view.MenuItemCompat
@@ -18,6 +19,7 @@ import android.view.View
 import android.view.animation.AccelerateDecelerateInterpolator
 import android.widget.EditText
 import android.widget.ProgressBar
+import android.widget.Toast
 import com.github.wrdlbrnft.sortedlistadapter.SortedListAdapter
 import com.simplecityapps.recyclerview_fastscroll.views.FastScrollRecyclerView
 import io.neoterm.R
@@ -90,20 +92,28 @@ class PackageManagerActivity : AppCompatActivity(), SearchView.OnQueryTextListen
         val sourceFiles = ArrayList<File>()
         val sourceUrl = NeoPreference.loadString(R.string.key_package_source, NeoTermPath.DEFAULT_SOURCE)
         val packageFilePrefix = detectSourceFilePrefix(sourceUrl)
-        File(NeoTermPath.PACKAGE_LIST_DIR).listFiles().filterTo(sourceFiles) { it.name.startsWith(packageFilePrefix) }
+        if (packageFilePrefix.isNotEmpty()) {
+            File(NeoTermPath.PACKAGE_LIST_DIR)
+                    .listFiles()
+                    .filterTo(sourceFiles) { it.name.startsWith(packageFilePrefix) }
+        }
         return sourceFiles
     }
 
     private fun detectSourceFilePrefix(sourceUrl: String): String {
-        val url = URL(sourceUrl)
-        val builder = StringBuilder()
-        builder.append(url.host)
-        builder.append("_")
-        if (url.path.isNotEmpty()) {
-            builder.append(url.path.substring(1)) // Skip '/'
+        try {
+            val url = URL(sourceUrl)
+            val builder = StringBuilder()
+            builder.append(url.host)
+            if (url.path != null && url.path.isNotEmpty()) {
+                builder.append("_")
+                builder.append(url.path.substring(1)) // Skip '/'
+            }
+            builder.append("_dists_stable_main_binary-")
+            return builder.toString()
+        } catch (e: Exception) {
+            return ""
         }
-        builder.append("_dists_stable_main_binary-")
-        return builder.toString()
     }
 
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {
@@ -118,29 +128,72 @@ class PackageManagerActivity : AppCompatActivity(), SearchView.OnQueryTextListen
         when (item?.itemId) {
             android.R.id.home -> finish()
             R.id.action_source -> changeSource()
+            R.id.action_update_and_refresh -> executeAptUpdate()
+            R.id.action_refresh -> refreshPackageList()
         }
         return super.onOptionsItemSelected(item)
     }
 
     private fun changeSource() {
+        val sourceList = resources.getStringArray(R.array.pref_package_source_values)
+        val currentSource = NeoPreference.loadString(R.string.key_package_source, NeoTermPath.DEFAULT_SOURCE)
+        var checkedItem = sourceList.indexOf(currentSource)
+        if (checkedItem == -1) {
+            checkedItem = sourceList.size - 1
+        }
+
+        @SuppressLint("ShowToast")
+        var toast = Toast.makeText(this, "", Toast.LENGTH_SHORT)
+        var selectedIndex = 0
+
+        AlertDialog.Builder(this)
+                .setTitle(R.string.pref_package_source)
+                .setSingleChoiceItems(R.array.pref_package_source_entries, checkedItem, { dialog, which ->
+                    if (which == sourceList.size - 1) {
+                        changeSourceToUserInput()
+                        dialog.dismiss()
+                    } else {
+                        selectedIndex = which
+                        toast.cancel()
+                        toast = Toast.makeText(this@PackageManagerActivity, sourceList[which], Toast.LENGTH_SHORT)
+                        toast.show()
+                    }
+                })
+                .setPositiveButton(android.R.string.yes, { _, _ ->
+                    if (selectedIndex != sourceList.size - 1) {
+                        changeSourceInternal(sourceList[selectedIndex])
+                    }
+                })
+                .setNegativeButton(android.R.string.no, null)
+                .show()
+    }
+
+    private fun changeSourceToUserInput() {
         val editText = EditText(this)
-        editText.setText(NeoPreference.loadString(R.string.key_package_source, NeoTermPath.DEFAULT_SOURCE))
+        val currentSource = NeoPreference.loadString(R.string.key_package_source, NeoTermPath.DEFAULT_SOURCE)
+        editText.setText(currentSource)
+        editText.requestFocus()
+        editText.setSelection(0, currentSource.length)
         AlertDialog.Builder(this)
                 .setTitle(R.string.pref_package_source)
                 .setView(editText)
                 .setNegativeButton(android.R.string.no, null)
                 .setPositiveButton(android.R.string.yes, { _, _ ->
                     val source = editText.text.toString()
-                    NeoPreference.store(R.string.key_package_source, source)
-
-                    val sourceFile = File(NeoTermPath.SOURCE_FILE)
-                    FileUtils.writeFile(sourceFile, generateSourceFile(source).toByteArray())
-                    postChangeSource()
+                    changeSourceInternal(source)
                 })
                 .show()
     }
 
-    private fun postChangeSource() {
+    private fun changeSourceInternal(source: String) {
+        NeoPreference.store(R.string.key_package_source, source)
+
+        val sourceFile = File(NeoTermPath.SOURCE_FILE)
+        FileUtils.writeFile(sourceFile, generateSourceFile(source).toByteArray())
+        executeAptUpdate()
+    }
+
+    private fun executeAptUpdate() {
         val dialog = TerminalDialog(this@PackageManagerActivity, DialogInterface.OnCancelListener {
             refreshPackageList()
         })
@@ -171,6 +224,10 @@ class PackageManagerActivity : AppCompatActivity(), SearchView.OnQueryTextListen
                 adapter.edit()
                         .replaceAll(models)
                         .commit()
+                if (models.isEmpty()) {
+                    Toast.makeText(this@PackageManagerActivity, R.string.package_list_empty, Toast.LENGTH_SHORT).show()
+                    changeSource()
+                }
             }
         }.start()
     }
diff --git a/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt b/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt
deleted file mode 100644
index bf0b989..0000000
--- a/app/src/main/java/io/neoterm/ui/settings/PackageSettingsActivity.kt
+++ /dev/null
@@ -1,62 +0,0 @@
-package io.neoterm.ui.settings
-
-import android.os.Bundle
-import android.support.v7.app.AlertDialog
-import android.support.v7.app.AppCompatPreferenceActivity
-import android.view.MenuItem
-import io.neoterm.R
-import io.neoterm.customize.NeoTermPath
-import io.neoterm.preference.NeoPreference
-import io.neoterm.utils.FileUtils
-import java.io.File
-
-/**
- * @author kiva
- */
-class PackageSettingsActivity : AppCompatPreferenceActivity() {
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        supportActionBar.title = getString(R.string.package_settings)
-        supportActionBar.setDisplayHomeAsUpEnabled(true)
-        addPreferencesFromResource(R.xml.settings_package)
-
-        val preference = findPreference(getString(R.string.key_package_source))
-        preference.summary = NeoPreference.loadString(R.string.key_package_source, NeoTermPath.DEFAULT_SOURCE)
-
-        preference.setOnPreferenceChangeListener { preference, newValue ->
-            val newSource = newValue as String
-            preference.summary = newSource
-            if (newSource.isNotEmpty()) {
-                val sourceFile = File(NeoTermPath.SOURCE_FILE)
-                FileUtils.writeFile(sourceFile, generateSourceFile(newSource).toByteArray())
-
-                AlertDialog.Builder(this@PackageSettingsActivity)
-                        .setMessage(R.string.source_changed)
-                        .setPositiveButton(android.R.string.yes, null)
-                        .show()
-            }
-            return@setOnPreferenceChangeListener true
-        }
-    }
-
-    private fun generateSourceFile(source: String): String {
-        return StringBuilder().append("# Generated by NeoTerm-Preference\n")
-                .append("deb ")
-                .append(source)
-                .append(" stable main")
-                .append("\n")
-                .toString()
-    }
-
-    override fun onBuildHeaders(target: MutableList<Header>?) {
-    }
-
-    override fun onOptionsItemSelected(item: MenuItem?): Boolean {
-        when (item?.itemId) {
-            android.R.id.home ->
-                finish()
-        }
-        return super.onOptionsItemSelected(item)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt b/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt
index a2cd59b..bcbdebe 100644
--- a/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt
+++ b/app/src/main/java/io/neoterm/view/tab/TermTabDecorator.kt
@@ -12,6 +12,7 @@ import de.mrapp.android.tabswitcher.Tab
 import de.mrapp.android.tabswitcher.TabSwitcher
 import de.mrapp.android.tabswitcher.TabSwitcherDecorator
 import io.neoterm.R
+import io.neoterm.customize.font.FontManager
 import io.neoterm.preference.NeoPreference
 import io.neoterm.ui.NeoTermActivity
 import io.neoterm.view.ExtraKeysView
@@ -69,7 +70,7 @@ class TermTabDecorator(val context: NeoTermActivity) : TabSwitcherDecorator() {
             return
         }
         view.textSize = NeoPreference.loadInt(NeoPreference.KEY_FONT_SIZE, 30)
-        view.setTypeface(Typeface.MONOSPACE)
+        view.setTypeface(FontManager.getCurrentFont())
         context.fullScreenToggleButton.setStatus(NeoPreference.loadBoolean(R.string.key_ui_fullscreen, false))
 
         if (tab is TermTab) {
diff --git a/app/src/main/res/menu/menu_pm.xml b/app/src/main/res/menu/menu_pm.xml
index ff8129c..1c3eafe 100644
--- a/app/src/main/res/menu/menu_pm.xml
+++ b/app/src/main/res/menu/menu_pm.xml
@@ -9,6 +9,16 @@
         app:actionViewClass="android.support.v7.widget.SearchView"
         app:showAsAction="ifRoom|collapseActionView" />
 
+    <item
+        android:id="@+id/action_refresh"
+        android:title="@string/menu_refresh_list"
+        app:showAsAction="never" />
+
+    <item
+        android:id="@+id/action_update_and_refresh"
+        android:title="@string/menu_update"
+        app:showAsAction="never" />
+
     <item
         android:id="@+id/action_source"
         android:title="@string/pref_package_source"
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index a66c143..064f841 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -43,6 +43,9 @@
     <string name="retry">重试</string>
     <string name="source_changed">APT 源已更改，你可能需要执行 apt update 来更新</string>
     <string name="package_details">软件包: %s\n版本: %s\n依赖: %s\n占用空间: %s\n描述: %s\n主页: %s</string>
+    <string name="package_list_empty">软件包列表为空，请检查你的软件源</string>
+    <string name="menu_refresh_list">刷新</string>
+    <string name="menu_update">更新 &amp; 刷新</string>
 
     <string-array name="pref_general_program_selection_entries">
         <item>只使用 NeoTerm</item>
@@ -51,4 +54,10 @@
     </string-array>
     <string name="done">完成</string>
     <string name="install">安装</string>
+
+    <string-array name="pref_package_source_entries">
+        <item>默认源 (稳定，推荐)</item>
+        <item>调试源 (可能不稳定)</item>
+        <item>输入…</item>
+    </string-array>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index f9b9576..3a44193 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -49,6 +49,9 @@
     <string name="done">Done</string>
     <string name="install">Install</string>
     <string name="package_details">Package: %s\nVersion: %s\nDepends: %s\nInstalled Size: %s\nDescription: %s\nHome Page: %s</string>
+    <string name="package_list_empty">Package list is empty, please check out your source.</string>
+    <string name="menu_refresh_list">Refresh</string>
+    <string name="menu_update">Update &amp; Refresh</string>
 
     <string-array name="pref_ui_color_scheme_entries" translatable="false">
         <item>Default</item>
@@ -73,4 +76,16 @@
         <item>System First</item>
     </string-array>
 
+    <string-array name="pref_package_source_entries">
+        <item>Default Source (stable, recommended)</item>
+        <item>Debug Source (maybe unstable)</item>
+        <item>Input…</item>
+    </string-array>
+
+    <string-array name="pref_package_source_values" translatable="false">
+        <item>https://mirrors.geekpie.org/neoterm</item>
+        <item>http://192.243.117.135</item>
+        <item>User-Input</item>
+    </string-array>
+
 </resources>
diff --git a/app/src/main/res/xml/settings_package.xml b/app/src/main/res/xml/settings_package.xml
deleted file mode 100644
index 8e1105d..0000000
--- a/app/src/main/res/xml/settings_package.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <EditTextPreference
-        android:defaultValue="https://mirrors.geekpie.org/neoterm"
-        android:key="@string/key_package_source"
-        android:title="@string/pref_package_source" />
-</PreferenceScreen>
\ No newline at end of file