diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
new file mode 100644
index 000000000..ae0bd47ca
--- /dev/null
+++ b/.github/workflows/linux.yml
@@ -0,0 +1,501 @@
+name: Linux.
+
+on:
+  push:
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+  pull_request:
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+
+jobs:
+
+  linux:
+    name: Ubuntu 14.04
+    runs-on: ubuntu-latest
+    container: ubuntu:trusty
+
+    strategy:
+      matrix:
+        defines:
+          - ""
+
+    env:
+      GIT: "https://github.com"
+      QT: "5_12_5"
+      QT_PREFIX: "/usr/local/desktop-app/Qt-5.12.5"
+      OPENSSL_VER: "1_1_1"
+      OPENSSL_PREFIX: "/usr/local/desktop-app/openssl-1.1.1"
+      CMAKE_VER: "3.16.3"
+      UPLOAD_ARTIFACT: "false"
+      ONLY_CACHE: "false"
+      MANUAL_CACHING: "1"
+      DOC_PATH: "docs/building-cmake.md"
+
+    steps:
+      - name: Get repository name.
+        run: echo ::set-env name=REPO_NAME::${GITHUB_REPOSITORY##*/}
+
+      - name: Clone.
+        uses: actions/checkout@v1
+        with:
+          submodules: recursive
+
+      - name: First set up.
+        run: |
+          cd ..
+          mv $REPO_NAME temp
+          mkdir $REPO_NAME
+          mv temp $REPO_NAME/$REPO_NAME
+          cd $REPO_NAME
+
+          sudo apt-get update
+          sudo apt-get install software-properties-common -y && \
+          sudo apt-get install git libexif-dev liblzma-dev libz-dev libssl-dev \
+          libappindicator-dev libicu-dev libdee-dev libdrm-dev dh-autoreconf \
+          autoconf automake build-essential libass-dev libfreetype6-dev \
+          libgpac-dev libsdl1.2-dev libtheora-dev libtool libva-dev libvdpau-dev \
+          libvorbis-dev libenchant-dev libxcb1-dev libxcb-image0-dev libxcb-shm0-dev \
+          libxcb-xfixes0-dev libxcb-keysyms1-dev libxcb-icccm4-dev libatspi2.0-dev \
+          libxcb-render-util0-dev libxcb-util0-dev libxcb-xkb-dev libxrender-dev \
+          libasound-dev libpulse-dev libxcb-sync0-dev libxcb-randr0-dev bison \
+          libx11-xcb-dev libffi-dev libncurses5-dev pkg-config texi2html yasm \
+          zlib1g-dev xutils-dev python-xcbgen chrpath gperf wget -y --force-yes && \
+          sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y && \
+          sudo apt-get update && \
+          sudo apt-get install gcc-8 g++-8 -y && \
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-8 60 && \
+          sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-8 60 && \
+          sudo update-alternatives --config gcc && \
+          sudo add-apt-repository --remove ppa:ubuntu-toolchain-r/test -y
+
+          gcc --version
+
+          gcc --version > CACHE_KEY.txt
+          echo $MANUAL_CACHING >> CACHE_KEY.txt
+          md5cache=$(md5sum CACHE_KEY.txt | cut -c -32)
+          echo ::set-env name=CACHE_KEY::$md5cache
+
+          mkdir -p Libraries
+          cd Libraries
+          echo ::set-env name=LibrariesPath::`pwd`
+
+      - name: Range-v3.
+        run: |
+          echo "Find necessary branch from doc."
+          cloneRange=$(grep -A 1 "range-v3" $REPO_NAME/$DOC_PATH | sed -n 1p)
+          cd $LibrariesPath
+          echo $cloneRange
+          eval $cloneRange
+
+      - name: Patches.
+        run: |
+          echo "Find necessary commit from doc."
+          checkoutCommit=$(grep -A 1 "cd patches" $REPO_NAME/$DOC_PATH | sed -n 2p)
+          cd $LibrariesPath
+          git clone $GIT/desktop-app/patches.git
+          cd patches
+          eval $checkoutCommit
+
+      - name: CMake.
+        run: |
+          cd $LibrariesPath
+
+          file=cmake-$CMAKE_VER-Linux-x86_64.sh
+          wget $GIT/Kitware/CMake/releases/download/v$CMAKE_VER/$file
+          sudo mkdir /opt/cmake
+          sudo sh $file --prefix=/opt/cmake --skip-license
+          sudo ln -s /opt/cmake/bin/cmake /usr/local/bin/cmake
+
+          cmake --version
+
+      - name: Zlib.
+        run: |
+          cd $LibrariesPath
+
+          git clone $GIT/madler/zlib.git
+          cd zlib
+          ./configure
+          make -j$(nproc)
+          sudo make install
+
+      - name: Opus cache.
+        id: cache-opus
+        uses: actions/cache@v1
+        with:
+          path: ${{ env.LibrariesPath }}/opus
+          key: ${{ runner.OS }}-opus-${{ env.CACHE_KEY }}
+      - name: Opus.
+        if: steps.cache-opus.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          git clone $GIT/xiph/opus
+          cd opus
+          git checkout v1.3
+          ./autogen.sh
+          ./configure
+          make -j$(nproc)
+      - name: Opus install.
+        run: |
+          cd $LibrariesPath/opus
+          sudo make install
+
+      - name: Libva.
+        run: |
+          cd $LibrariesPath
+
+          git clone $GIT/01org/libva.git
+          cd libva
+          ./autogen.sh --enable-static
+          make -j$(nproc)
+          sudo make install
+
+      - name: Libvdpau.
+        run: |
+          cd $LibrariesPath
+
+          git clone git://anongit.freedesktop.org/vdpau/libvdpau
+          cd libvdpau
+          git checkout libvdpau-1.2
+          ./autogen.sh --enable-static
+          make -j$(nproc)
+          sudo make install
+
+      - name: FFmpeg cache.
+        id: cache-ffmpeg
+        uses: actions/cache@v1
+        with:
+          path: ${{ env.LibrariesPath }}/ffmpeg-cache
+          key: ${{ runner.OS }}-ffmpeg-${{ env.CACHE_KEY }}
+      - name: FFmpeg build.
+        if: steps.cache-ffmpeg.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          git clone --branch release/3.4 $GIT/FFmpeg/FFmpeg ffmpeg
+          cd ffmpeg
+          ./configure --prefix=$LibrariesPath/ffmpeg-cache \
+          --enable-protocol=file --enable-libopus \
+          --disable-programs \
+          --disable-doc \
+          --disable-network \
+          --disable-everything \
+          --enable-hwaccel=h264_vaapi \
+          --enable-hwaccel=h264_vdpau \
+          --enable-hwaccel=mpeg4_vaapi \
+          --enable-hwaccel=mpeg4_vdpau \
+          --enable-decoder=aac \
+          --enable-decoder=aac_at \
+          --enable-decoder=aac_fixed \
+          --enable-decoder=aac_latm \
+          --enable-decoder=aasc \
+          --enable-decoder=alac \
+          --enable-decoder=alac_at \
+          --enable-decoder=flac \
+          --enable-decoder=gif \
+          --enable-decoder=h264 \
+          --enable-decoder=h264_vdpau \
+          --enable-decoder=hevc \
+          --enable-decoder=mp1 \
+          --enable-decoder=mp1float \
+          --enable-decoder=mp2 \
+          --enable-decoder=mp2float \
+          --enable-decoder=mp3 \
+          --enable-decoder=mp3adu \
+          --enable-decoder=mp3adufloat \
+          --enable-decoder=mp3float \
+          --enable-decoder=mp3on4 \
+          --enable-decoder=mp3on4float \
+          --enable-decoder=mpeg4 \
+          --enable-decoder=mpeg4_vdpau \
+          --enable-decoder=msmpeg4v2 \
+          --enable-decoder=msmpeg4v3 \
+          --enable-decoder=opus \
+          --enable-decoder=pcm_alaw \
+          --enable-decoder=pcm_alaw_at \
+          --enable-decoder=pcm_f32be \
+          --enable-decoder=pcm_f32le \
+          --enable-decoder=pcm_f64be \
+          --enable-decoder=pcm_f64le \
+          --enable-decoder=pcm_lxf \
+          --enable-decoder=pcm_mulaw \
+          --enable-decoder=pcm_mulaw_at \
+          --enable-decoder=pcm_s16be \
+          --enable-decoder=pcm_s16be_planar \
+          --enable-decoder=pcm_s16le \
+          --enable-decoder=pcm_s16le_planar \
+          --enable-decoder=pcm_s24be \
+          --enable-decoder=pcm_s24daud \
+          --enable-decoder=pcm_s24le \
+          --enable-decoder=pcm_s24le_planar \
+          --enable-decoder=pcm_s32be \
+          --enable-decoder=pcm_s32le \
+          --enable-decoder=pcm_s32le_planar \
+          --enable-decoder=pcm_s64be \
+          --enable-decoder=pcm_s64le \
+          --enable-decoder=pcm_s8 \
+          --enable-decoder=pcm_s8_planar \
+          --enable-decoder=pcm_u16be \
+          --enable-decoder=pcm_u16le \
+          --enable-decoder=pcm_u24be \
+          --enable-decoder=pcm_u24le \
+          --enable-decoder=pcm_u32be \
+          --enable-decoder=pcm_u32le \
+          --enable-decoder=pcm_u8 \
+          --enable-decoder=pcm_zork \
+          --enable-decoder=vorbis \
+          --enable-decoder=wavpack \
+          --enable-decoder=wmalossless \
+          --enable-decoder=wmapro \
+          --enable-decoder=wmav1 \
+          --enable-decoder=wmav2 \
+          --enable-decoder=wmavoice \
+          --enable-encoder=libopus \
+          --enable-parser=aac \
+          --enable-parser=aac_latm \
+          --enable-parser=flac \
+          --enable-parser=h264 \
+          --enable-parser=hevc \
+          --enable-parser=mpeg4video \
+          --enable-parser=mpegaudio \
+          --enable-parser=opus \
+          --enable-parser=vorbis \
+          --enable-demuxer=aac \
+          --enable-demuxer=flac \
+          --enable-demuxer=gif \
+          --enable-demuxer=h264 \
+          --enable-demuxer=hevc \
+          --enable-demuxer=m4v \
+          --enable-demuxer=mov \
+          --enable-demuxer=mp3 \
+          --enable-demuxer=ogg \
+          --enable-demuxer=wav \
+          --enable-muxer=ogg \
+          --enable-muxer=opus
+
+          make -j$(nproc)
+          sudo make install
+      - name: FFmpeg install.
+        run: |
+          cd $LibrariesPath
+          #List of files from cmake/external/ffmpeg/CMakeLists.txt.
+          copyLib() {
+            mkdir -p ffmpeg/$1
+            yes | cp -i ffmpeg-cache/lib/$1.a ffmpeg/$1/$1.a
+          }
+          copyLib libavformat
+          copyLib libavcodec
+          copyLib libswresample
+          copyLib libswscale
+          copyLib libavutil
+
+          sudo cp -R ffmpeg-cache/. /usr/local/
+
+      - name: PortAudio.
+        run: |
+          cd $LibrariesPath
+
+          git clone https://git.assembla.com/portaudio.git
+          cd portaudio
+          git checkout 396fe4b669
+          ./configure
+          make -j$(nproc)
+          sudo make install
+
+      - name: OpenAL Soft.
+        run: |
+          cd $LibrariesPath
+
+          git clone $GIT/kcat/openal-soft.git
+          cd openal-soft
+          git checkout openal-soft-1.19.1
+          cd build
+          cmake -D LIBTYPE:STRING=STATIC ..
+          make -j$(nproc)
+          sudo make install
+
+      - name: OpenSSL cache.
+        id: cache-openssl
+        uses: actions/cache@v1
+        with:
+          path: ${{ env.LibrariesPath }}/openssl-cache
+          key: ${{ runner.OS }}-${{ env.OPENSSL_VER }}-${{ env.CACHE_KEY }}
+      - name: OpenSSL build.
+        if: steps.cache-openssl.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          git clone $GIT/openssl/openssl openssl_$OPENSSL_VER
+          cd openssl_$OPENSSL_VER
+          git checkout OpenSSL_1_1_1-stable
+          ./config --prefix=$LibrariesPath/openssl-cache
+          make -j$(nproc)
+          sudo make install
+      - name: OpenSSL install.
+        run: |
+          cd $LibrariesPath
+          sudo mkdir -p $OPENSSL_PREFIX
+          sudo cp -R openssl-cache/. $OPENSSL_PREFIX/
+
+      - name: Libxkbcommon.
+        run: |
+          cd $LibrariesPath
+
+          git clone $GIT/xkbcommon/libxkbcommon.git
+          cd libxkbcommon
+          git checkout xkbcommon-0.8.4
+          ./autogen.sh
+          make -j$(nproc)
+          sudo make install
+
+      - name: Qt 5.12.5 cache.
+        id: cache-qt
+        uses: actions/cache@v1
+        with:
+          path: ${{ env.LibrariesPath }}/qt-cache
+          key: ${{ runner.OS }}-qt-${{ env.CACHE_KEY }}-${{ hashFiles('**/qtbase_5_12_5.diff') }}
+      - name: Qt 5.12.5 build.
+        if: steps.cache-qt.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          git clone git://code.qt.io/qt/qt5.git qt_$QT
+          cd qt_$QT
+          perl init-repository --module-subset=qtbase,qtimageformats
+          git checkout v5.12.5
+          git submodule update qtbase
+          git submodule update qtimageformats
+          cd qtbase
+          git apply ../../patches/qtbase_$QT.diff
+          cd src/plugins/platforminputcontexts
+          git clone $GIT/desktop-app/fcitx.git
+          git clone $GIT/desktop-app/hime.git
+          git clone $GIT/desktop-app/nimf.git
+          cd ../../../..
+
+          ./configure -prefix "$LibrariesPath/qt-cache" \
+          -release \
+          -force-debug-info \
+          -opensource \
+          -confirm-license \
+          -qt-zlib \
+          -qt-libpng \
+          -qt-libjpeg \
+          -qt-harfbuzz \
+          -qt-pcre \
+          -qt-xcb \
+          -system-freetype \
+          -fontconfig \
+          -no-opengl \
+          -no-gtk \
+          -static \
+          -openssl-linked \
+          -I "$OPENSSL_PREFIX/include" OPENSSL_LIBS="$OPENSSL_PREFIX/lib/libssl.a $OPENSSL_PREFIX/lib/libcrypto.a -ldl -lpthread" \
+          -nomake examples \
+          -nomake tests
+
+          make -j$(nproc)
+          sudo make install
+      - name: Qt 5.12.5 install.
+        run: |
+          cd $LibrariesPath
+          sudo mkdir -p $QT_PREFIX
+          sudo cp -R qt-cache/. $QT_PREFIX/
+
+      - name: Breakpad cache.
+        id: cache-breakpad
+        uses: actions/cache@v1
+        with:
+          path: ${{ env.LibrariesPath }}/breakpad-cache
+          key: ${{ runner.OS }}-breakpad-${{ env.CACHE_KEY }}
+      - name: Breakpad clone.
+        run: |
+          cd $LibrariesPath
+
+          git clone https://chromium.googlesource.com/breakpad/breakpad
+          cd breakpad
+          git checkout bc8fb886
+          git clone https://chromium.googlesource.com/linux-syscall-support src/third_party/lss
+          cd src/third_party/lss
+          git checkout a91633d1
+      - name: Breakpad build.
+        if: steps.cache-breakpad.outputs.cache-hit != 'true'
+        run: |
+          cd $LibrariesPath
+
+          BreakpadCache=$LibrariesPath/breakpad-cache
+
+          git clone https://chromium.googlesource.com/external/gyp
+          cd gyp
+          git checkout 9f2a7bb1
+          git apply ../patches/gyp.diff
+          cd ..
+
+          cd breakpad
+          ./configure --prefix=$BreakpadCache
+          make -j$(nproc)
+          sudo make install
+          cd src
+          rm -r testing
+          git clone $GIT/google/googletest testing
+          cd tools
+          sed -i 's/minidump_upload.m/minidump_upload.cc/' linux/tools_linux.gypi
+          ../../../gyp/gyp  --depth=. --generator-output=.. -Goutput_dir=../out tools.gyp --format=cmake
+          cd ../../out/Default
+          cmake .
+          make -j$(nproc) dump_syms
+
+          mv dump_syms $BreakpadCache/
+      - name: Breakpad install.
+        run: |
+          cd $LibrariesPath
+          sudo cp -R breakpad-cache/. /usr/local/
+          mkdir -p breakpad/out/Default/
+          cp breakpad-cache/dump_syms breakpad/out/Default/dump_syms
+
+      - name: Telegram Desktop build.
+        if: env.ONLY_CACHE == 'false'
+        run: |
+          cd $REPO_NAME/Telegram
+
+          DEFINE=""
+          if [ -n "${{ matrix.defines }}" ]; then
+            DEFINE="-D ${{ matrix.defines }}=ON"
+            echo Define from matrix: $DEFINE
+          fi
+
+          ./configure.sh -D TDESKTOP_API_TEST=ON -D DESKTOP_APP_USE_PACKAGED=OFF $DEFINE
+
+          cd ../out/Debug
+          make -j$(nproc)
+          strip -s bin/Telegram
+
+      - name: Check.
+        if: env.ONLY_CACHE == 'false'
+        run: |
+          filePath="$REPO_NAME/out/Debug/bin/Telegram"
+          if test -f "$filePath"; then
+            echo "Build successfully done! :)"
+
+            size=$(stat -c %s "$filePath")
+            echo "File size of ${filePath}: ${size} Bytes."
+          else
+            echo "Build error, output file does not exist."
+            exit 1
+          fi
+
+      - name: Move artifact.
+        if: env.UPLOAD_ARTIFACT == 'true'
+        run: |
+          cd $REPO_NAME/out/Debug/bin
+          mkdir artifact
+          mv Telegram artifact/
+      - uses: actions/upload-artifact@master
+        if: env.UPLOAD_ARTIFACT == 'true'
+        name: Upload artifact.
+        with:
+          name: Telegram
+          path: ${{ env.REPO_NAME }}/out/Debug/bin/artifact/
diff --git a/README.md b/README.md
index 1edca7cdd..35d7aa0a3 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,7 @@ This is the complete source code and the build instructions for the alpha versio
 [![Version](https://badge.fury.io/gh/telegramdesktop%2Ftdesktop.svg)](https://github.com/telegramdesktop/tdesktop/releases)
 [![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/Windows./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
 [![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/MacOS./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
+[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/Linux./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
 [![Build Status](https://travis-ci.org/telegramdesktop/tdesktop.svg?branch=dev)](https://travis-ci.org/telegramdesktop/tdesktop)
 
 [![Preview of Telegram Desktop][preview_image]][preview_image_url]