diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index cfa87166a..4a2457c31 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,10 +21,16 @@ jobs:
           python-version: '3.8'
       - name: Preprocess
         run: | 
-          cd lib/server
-          wget -q ${{ secrets.SECRET_SALT }}
-          wget -q ${{ secrets.SECRET_WSALT }}
-          cd ../..
+          # cd lib/server
+          # wget -q ${{ secrets.SECRET_SALT }}
+          # wget -q ${{ secrets.SECRET_WSALT }}
+          # cd ../..
+          cat >> lib/server/salt.dart << EOF
+            String getValid(foo) {return foo;}
+          EOF
+          cat >> lib/server/wsalt.dart << EOF
+            String getValid(foo) {return foo;}
+          EOF
           python3 preprocess-ios.py
       - name: Podfile
         run: |
@@ -48,6 +54,56 @@ jobs:
           name: ipa-build
           path: Payload.ipa
 
+  # https://github.com/AppImageCrafters/appimage-builder-flutter-example/blob/main/.github/workflows/appimage.yml
+  linux-build:
+    name: Build
+    runs-on: Ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v2
+    - uses: subosito/flutter-action@v1
+      # with:
+        # flutter-version: '1.22.4'
+    - run: flutter channel beta
+    - run: flutter upgrade
+    - run: flutter config --enable-linux-desktop
+    - name: "Install dependencies"
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y cmake ninja-build build-essential pkg-config curl file git unzip xz-utils zip libgtk-3-dev
+    - name: Build flutter app
+      run: |
+        # cd lib/server
+        # wget -q ${{ secrets.SECRET_SALT }}
+        # wget -q ${{ secrets.SECRET_WSALT }}
+        # cd ../..
+        python3 preprocess-linux.py
+        cat >> lib/server/salt.dart << EOF
+          String getValid(foo) {return foo;}
+        EOF
+        cat >> lib/server/wsalt.dart << EOF
+          String getValid(foo) {return foo;}
+        EOF
+        flutter build linux
+    - name: Build AppImage unsing appimage-builder
+      uses: docker://appimagecrafters/appimage-builder:0.8.5
+      with:
+        entrypoint: appimage-builder
+        args: --recipe ./AppImageBuilder.yml --skip-test
+    - name: Save build Artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: AppImage
+        path: './*.AppImage*'
+    - name: Release AppImage
+      uses: marvinpinto/action-automatic-releases@latest
+      with:
+        title: Continuous build
+        automatic_release_tag: 'continuous'
+        prerelease: true
+        draft: false
+        files: './*.AppImage*'
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+
   android-build:
     runs-on: ubuntu-latest
     steps:
@@ -66,10 +122,10 @@ jobs:
           python-version: '3.8'
       - name: Preprocess
         run: | 
-          cd lib/server
-          wget -q ${{ secrets.SECRET_SALT }}
-          wget -q ${{ secrets.SECRET_WSALT }}
-          cd ../..
+          # cd lib/server
+          # wget -q ${{ secrets.SECRET_SALT }}
+          # wget -q ${{ secrets.SECRET_WSALT }}
+          # cd ../..
           python3 preprocess-android.py
       - name: Build
         run: |
diff --git a/.gitignore b/.gitignore
index 0efcc6c57..a4ae24dcc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,9 @@ migrate_working_dir/
 .pub-cache/
 .pub/
 /build/
+/AppDir/
+*.AppImage
+*.appimage
 
 # Web related
 lib/generated_plugin_registrant.dart
@@ -62,4 +65,4 @@ emulator.bat
 img/*
 test/db
 test/*.7z
-test/rawdata-korean
\ No newline at end of file
+test/rawdata-korean
diff --git a/AppImageBuilder.yml b/AppImageBuilder.yml
new file mode 100644
index 000000000..56b1b6877
--- /dev/null
+++ b/AppImageBuilder.yml
@@ -0,0 +1,73 @@
+# appimage-builder recipe see https://appimage-builder.readthedocs.io for details
+version: 1
+script:
+ - rm -rf AppDir || true
+ - cp -r build/linux/x64/release/bundle AppDir
+ - mkdir -p AppDir/usr/share/icons/hicolor/64x64/apps/
+ - cp assets/images/logo.png AppDir/usr/share/icons/hicolor/64x64/apps/
+AppDir:
+  path: ./AppDir
+  app_info:
+    id: org.appimagecrafters.hello-flutter
+    name: Hello Flutter
+    icon: logo
+    version: latest
+    exec: hello_flutter
+    exec_args: $@
+  apt:
+    arch: amd64
+    allow_unauthenticated: true
+    sources:
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic main restricted
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic-updates main restricted
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic universe
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic-updates universe
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic multiverse
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic-updates multiverse
+    - sourceline: deb http://archive.ubuntu.com/ubuntu/ bionic-backports main restricted universe multiverse
+    - sourceline: deb http://security.ubuntu.com/ubuntu bionic-security main restricted
+    - sourceline: deb http://security.ubuntu.com/ubuntu bionic-security universe
+    - sourceline: deb http://security.ubuntu.com/ubuntu bionic-security multiverse
+    include:
+    - libgtk-3-0
+    exclude:
+    - humanity-icon-theme
+    - hicolor-icon-theme
+    - adwaita-icon-theme
+    - ubuntu-mono
+  files:
+    exclude:
+    - usr/share/man
+    - usr/share/doc/*/README.*
+    - usr/share/doc/*/changelog.*
+    - usr/share/doc/*/NEWS.*
+    - usr/share/doc/*/TODO.*
+  runtime:
+    env:
+      GIO_MODULE_DIR: $APPDIR/usr/lib/x86_64-linux-gnu/gio/modules/
+  test:
+    fedora:
+      image: appimagecrafters/tests-env:fedora-30
+      command: ./AppRun
+      use_host_x: true
+    debian:
+      image: appimagecrafters/tests-env:debian-stable
+      command: ./AppRun
+      use_host_x: true
+    arch:
+      image: appimagecrafters/tests-env:archlinux-latest
+      command: ./AppRun
+      use_host_x: true
+    centos:
+      image: appimagecrafters/tests-env:centos-7
+      command: ./AppRun
+      use_host_x: true
+    ubuntu:
+      image: appimagecrafters/tests-env:ubuntu-xenial
+      command: ./AppRun
+      use_host_x: true
+AppImage:
+  arch: x86_64
+  update-information: guess
+  sign-key: None
+
diff --git a/preprocess-ios.py b/preprocess-ios.py
index 961247eae..8b29715ed 100644
--- a/preprocess-ios.py
+++ b/preprocess-ios.py
@@ -109,4 +109,4 @@ def create_dummy_valid(path):
             process_yaml(root + '/' +  filename)
 
 # create_dummy_valid('./lib/server/salt.dart')
-# create_dummy_valid('./lib/server/wsalt.dart')
\ No newline at end of file
+# create_dummy_valid('./lib/server/wsalt.dart')
diff --git a/preprocess-linux.py b/preprocess-linux.py
new file mode 100644
index 000000000..92d132722
--- /dev/null
+++ b/preprocess-linux.py
@@ -0,0 +1,112 @@
+# This source code is a part of Project Violet.
+# Copyright (C) 2021.violet-team. Licensed under the Apache-2.0 License.
+
+import sys
+import os
+import os.path
+import re
+
+target = 'linux'
+
+def process_dart(path):
+    f = open(path, 'r')
+    w = []
+    nl = False
+    op = False
+    for line in f.readlines():
+        if '//' in line:
+            annote = re.split(r': |, | ',line.split('//')[-1].strip())
+
+            if not annote[0].startswith('@dependent'):
+                if nl or op:
+                    nl = False
+                else:
+                    w.append(line)
+                continue
+
+            if annote[1] == target:
+                w.append(line)
+                continue
+
+            if len(annote) == 2:
+                continue
+
+            if annote[2] == '=>':
+                nl = True
+                continue
+
+            if annote[2] == '[':
+                op = True
+                continue
+
+            if annote[2] == ']':
+                op = False
+                continue
+        else:
+            if nl or op:
+                nl = False
+            else:
+                w.append(line)
+    f.close()
+    f = open(path, 'w+')
+    f.writelines(w)
+    f.close()
+
+def process_yaml(path):
+    f = open(path, 'r')
+    w = []
+    nl = False
+    op = False
+    for line in f.readlines():
+        if '#' in line:
+            annote = re.split(r': |, | ', line.split('#')[-1].strip())
+
+            if not annote[0].startswith('@dependent'):
+                if nl or op:
+                    nl = False
+                else:
+                    w.append(line)
+                continue
+
+            if annote[1] == target:
+                w.append(line)
+                continue
+
+            if len(annote) == 2:
+                continue
+
+            if annote[2] == '=>':
+                nl = True
+                continue
+
+            if annote[2] == '[':
+                op = True
+                continue
+
+            if annote[2] == ']':
+                op = False
+                continue
+        else:
+            if nl or op:
+                nl = False
+            else:
+                w.append(line)
+    f.close()
+    f = open(path, 'w+')
+    f.writelines(w)
+    f.close()
+
+def create_dummy_valid(path):
+    f = open(path, 'w')
+    f.writelines(['String getValid(foo) {return foo;}'])
+    f.close()
+
+for root, subdirs, files in os.walk('./'):
+    for filename in files:
+        if filename.endswith(".dart"): 
+            process_dart(root + '/' + filename)
+        elif filename.endswith(".yaml"):
+            process_yaml(root + '/' +  filename)
+
+# create_dummy_valid('./lib/server/salt.dart')
+# create_dummy_valid('./lib/server/wsalt.dart')