diff --git a/.github/workflows/ccpp_ubuntu_gtk3.yml b/.github/workflows/ccpp_ubuntu_gtk3.yml
new file mode 100644
index 000000000..1267c02fc
--- /dev/null
+++ b/.github/workflows/ccpp_ubuntu_gtk3.yml
@@ -0,0 +1,94 @@
+name: C/C++ Nigthly ubuntu
+
+on:
+  push:
+    branches:
+      - Nigthly
+
+jobs:
+  build:
+
+    runs-on: ubuntu-18.04
+    
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: 'Nigthly'
+    - name: update submodule profiles
+      working-directory: ./resources/profiles
+      run: git submodule update --init
+    - name: change date in version
+      run: sed -i "s/+UNKNOWN/_$(date '+%F')/" version.inc
+    - name: update clock
+      run: sudo hwclock -s
+    - name: update apt
+      run: sudo apt update
+    - name: install gtk2 glew
+      run: sudo apt install libgtk-3-dev libglew-dev libudev-dev libdbus-1-dev
+    - name: mkdir in deps
+      run: mkdir deps/build
+    - name: cmake deps
+      working-directory: ./deps/build
+      run: cmake .. -DDEP_WX_GTK3=ON
+    - name: make deps
+      working-directory: ./deps/build
+      run: make
+    - name: rename wxscintilla
+      working-directory: ./deps/build/destdir/usr/local/lib
+      run: cp libwxscintilla-3.1.a libwx_gtk3u_scintilla-3.1.a
+    - name: ls libs
+      working-directory: ./deps/build
+      run: ls ./destdir/usr/local/lib
+    - name: clean deps
+      working-directory: ./deps/build
+      run: rm -rf dep_*
+    - name: mkdir build
+      run: mkdir build
+    - name: cmake
+      working-directory: ./build
+      run: cmake .. -DSLIC3R_GTK=3 -DCMAKE_PREFIX_PATH="/home/runner/work/Slic3r/Slic3r/deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+    - name: make Slic3r
+      working-directory: ./build
+      run: make Slic3r
+    - name: make .mo
+      working-directory: ./build
+      run: make gettext_po_to_mo
+    - name: make .pot
+      working-directory: ./build
+      run: make gettext_make_pot
+    - name: create directory and copy into it
+      working-directory: ./build
+      run: |
+        mkdir package
+        mkdir package/bin
+    - name: copy resources
+      working-directory: ./build
+      run: cp -Rf ../resources package/resources
+    - name: copy bin
+      working-directory: ./build
+      run: cp -f src/Slic3r package/bin/Slic3r
+    - name: create sh from echo
+      working-directory: ./build/package
+      run: |
+        echo -e '#!/bin/bash\nDIR=$(readlink -f "$0" | xargs dirname)\nexport LD_LIBRARY_PATH="$DIR/bin"\nexec "$DIR/bin/Slic3r" "$@"' >Slic3r
+        chmod u+x Slic3r
+        tar -cvf ../Slic3r.tar .
+    - name: Upload artifact
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: nightly_linux.tar
+        path: build/Slic3r.tar
+    - name: build appimage
+      working-directory: ./build/package
+      run: |
+        chmod +x ../build_appimage.sh
+        ../build_appimage.sh
+    - name: 'Tar files'
+      working-directory: ./build/package
+      run: tar -cvf Slic3r_ubu64.AppImage.tar Slic3r_ubu64.AppImage
+    - name: Upload appimage
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: Slic3r-AppImage.tar
+        path: build/package/Slic3r_ubu64.AppImage.tar
+        
diff --git a/.github/workflows/ccpp_ubuntu_gtk3_debug.yml b/.github/workflows/ccpp_ubuntu_gtk3_debug.yml
new file mode 100644
index 000000000..17c599c4a
--- /dev/null
+++ b/.github/workflows/ccpp_ubuntu_gtk3_debug.yml
@@ -0,0 +1,91 @@
+name: C/C++ debug ubuntu
+
+on:
+  push:
+    branches:
+      - debug_ubuntu
+
+jobs:
+  build:
+
+    runs-on: ubuntu-18.04
+    
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: 'debug_ubuntu'
+    - name: update submodule profiles
+      working-directory: ./resources/profiles
+      run: git submodule update --init
+    - name: change date in version
+      run: sed -i "s/+UNKNOWN/_$(date '+%F')/" version.inc
+    - name: update clock
+      run: sudo hwclock -s
+    - name: update apt
+      run: sudo apt update
+    - name: install gtk2 glew
+      run: sudo apt install libgtk-3-dev libglew-dev libudev-dev libdbus-1-dev
+    - name: mkdir in deps
+      run: mkdir deps/build
+    - name: cmake deps
+      working-directory: ./deps/build
+      run: cmake .. -DDEP_WX_GTK3=ON -DCMAKE_BUILD_TYPE=Debug
+    - name: make deps
+      working-directory: ./deps/build
+      run: make
+    - name: ls libs
+      working-directory: ./deps/build
+      run: ls ./destdir/usr/local/lib
+    - name: rename wxscintilla
+      working-directory: ./deps/build/destdir/usr/local/lib
+      run: cp libwxscintilla-3.1.a libwx_gtk3u_scintilla-3.1.a
+    - name: clean deps
+      working-directory: ./deps/build
+      run: rm -rf dep_*
+    - name: mkdir build
+      run: mkdir build
+    - name: cmake
+      working-directory: ./build
+      run: cmake .. -DSLIC3R_GTK=3 -DCMAKE_BUILD_TYPE=Debug -DCMAKE_PREFIX_PATH="/home/runner/work/Slic3r/Slic3r/deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+    - name: make Slic3r
+      working-directory: ./build
+      run: make Slic3r
+    - name: make .mo
+      working-directory: ./build
+      run: make gettext_po_to_mo
+    - name: create directory and copy into it
+      working-directory: ./build
+      run: |
+        mkdir package
+        mkdir package/bin
+    - name: copy resources
+      working-directory: ./build
+      run: cp -Rf ../resources package/resources
+    - name: copy bin
+      working-directory: ./build
+      run: cp -f src/Slic3r package/bin/Slic3r
+    - name: create sh from echo
+      working-directory: ./build/package
+      run: |
+        echo -e '#!/bin/bash\nDIR=$(readlink -f "$0" | xargs dirname)\nexport LD_LIBRARY_PATH="$DIR/bin"\nexec "$DIR/bin/Slic3r" "$@"' >Slic3r
+        chmod u+x Slic3r
+        tar -cvf ../Slic3r.tar .
+    - name: Upload artifact
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: nightly_linux.tar
+        path: build/Slic3r.tar
+    - name: build appimage
+      working-directory: ./build/package
+      run: |
+        chmod +x ../build_appimage.sh
+        ../build_appimage.sh
+    - name: 'Tar files'
+      working-directory: ./build/package
+      run: tar -cvf Slic3r_ubu64.AppImage.tar Slic3r_ubu64.AppImage
+    - name: Upload appimage
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: Slic3r-AppImage.tar
+        path: build/package/Slic3r_ubu64.AppImage.tar
+        
diff --git a/.github/workflows/ccpp_ubuntu_gtk3_rc.yml b/.github/workflows/ccpp_ubuntu_gtk3_rc.yml
new file mode 100644
index 000000000..961a76b48
--- /dev/null
+++ b/.github/workflows/ccpp_ubuntu_gtk3_rc.yml
@@ -0,0 +1,94 @@
+name: C/C++ Nigthly ubuntu
+
+on:
+  push:
+    branches:
+      - rc
+
+jobs:
+  build:
+
+    runs-on: ubuntu-18.04
+    
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: 'rc'
+    - name: update submodule profiles
+      working-directory: ./resources/profiles
+      run: git submodule update --init
+    - name: change date in version
+      run: sed -i "s/+UNKNOWN//" version.inc
+    - name: update clock
+      run: sudo hwclock -s
+    - name: update apt
+      run: sudo apt update
+    - name: install gtk2 glew
+      run: sudo apt install libgtk-3-dev libglew-dev libudev-dev libdbus-1-dev
+    - name: mkdir in deps
+      run: mkdir deps/build
+    - name: cmake deps
+      working-directory: ./deps/build
+      run: cmake .. -DDEP_WX_GTK3=ON
+    - name: make deps
+      working-directory: ./deps/build
+      run: make
+    - name: rename wxscintilla
+      working-directory: ./deps/build/destdir/usr/local/lib
+      run: cp libwxscintilla-3.1.a libwx_gtk3u_scintilla-3.1.a
+    - name: ls libs
+      working-directory: ./deps/build
+      run: ls ./destdir/usr/local/lib
+    - name: clean deps
+      working-directory: ./deps/build
+      run: rm -rf dep_*
+    - name: mkdir build
+      run: mkdir build
+    - name: cmake
+      working-directory: ./build
+      run: cmake .. -DSLIC3R_GTK=3 -DCMAKE_PREFIX_PATH="/home/runner/work/Slic3r/Slic3r/deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+    - name: make Slic3r
+      working-directory: ./build
+      run: make Slic3r
+    - name: make .mo
+      working-directory: ./build
+      run: make gettext_po_to_mo
+    - name: make .pot
+      working-directory: ./build
+      run: make gettext_make_pot
+    - name: create directory and copy into it
+      working-directory: ./build
+      run: |
+        mkdir package
+        mkdir package/bin
+    - name: copy resources
+      working-directory: ./build
+      run: cp -Rf ../resources package/resources
+    - name: copy bin
+      working-directory: ./build
+      run: cp -f src/Slic3r package/bin/Slic3r
+    - name: create sh from echo
+      working-directory: ./build/package
+      run: |
+        echo -e '#!/bin/bash\nDIR=$(readlink -f "$0" | xargs dirname)\nexport LD_LIBRARY_PATH="$DIR/bin"\nexec "$DIR/bin/Slic3r" "$@"' >Slic3r
+        chmod u+x Slic3r
+        tar -cvf ../Slic3r.tar .
+    - name: Upload artifact
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: rc_linux.tar
+        path: build/Slic3r.tar
+    - name: build appimage
+      working-directory: ./build/package
+      run: |
+        chmod +x ../build_appimage.sh
+        ../build_appimage.sh
+    - name: 'Tar files'
+      working-directory: ./build/package
+      run: tar -cvf Slic3r_ubu64.AppImage.tar Slic3r_ubu64.AppImage
+    - name: Upload appimage
+      uses: actions/upload-artifact@v1.0.0
+      with:
+        name: rc-Slic3r-AppImage.tar
+        path: build/package/Slic3r_ubu64.AppImage.tar
+        
diff --git a/BuildLinux.sh b/BuildLinux.sh
index 189b08914..ac51175a3 100755
--- a/BuildLinux.sh
+++ b/BuildLinux.sh
@@ -48,24 +48,38 @@ then
     mkdir build
 fi
 
+FOUND_GTK2=$(dpkg -l libgtk* | grep gtk2)
+FOUND_GTK3=$(dpkg -l libgtk* | grep gtk-3)
+
 if [[ -n "$UPDATE_LIB" ]]
 then
-    echo -n "Updating linux ..."
+    echo -n -e "Updating linux ...\n"
     hwclock -s
     apt update
-    apt install libgtk2.0-dev libglew-dev libudev-dev libdbus-1-dev cmake git
-    echo "done"
+    if [[ -z "$FOUND_GTK3" ]]
+    then
+    	echo -e "\nInstalling: libgtk2.0-dev libglew-dev libudev-dev libdbus-1-dev cmake git\n"
+        apt install libgtk2.0-dev libglew-dev libudev-dev libdbus-1-dev cmake git
+    else
+    	echo -e "\nFind libgtk-3, installing: libgtk-3-dev libglew-dev libudev-dev libdbus-1-dev cmake git\n"
+        apt install libgtk-3-dev libglew-dev libudev-dev libdbus-1-dev cmake git
+    fi
+    echo -e "done\n"
     exit 0
 fi
 
-FOUND_GTK2=$(dpkg -l libgtk* | grep gtk2.0-dev)
+FOUND_GTK2_DEV=$(dpkg -l libgtk* | grep gtk2.0-dev)
+FOUND_GTK3_DEV=$(dpkg -l libgtk* | grep gtk-3-dev)
 echo "FOUND_GTK2=$FOUND_GTK2)"
-if [[ -z "$FOUND_GTK2" ]]
+if [[ -z "$FOUND_GTK2_DEV" ]]
+then
+if [[ -z "$FOUND_GTK3_DEV" ]]
 then
     echo "Error, you must install the dependencies before."
     echo "Use option -u with sudo"
     exit 0
 fi
+fi
 
 echo "[1/9] Updating submodules..."
 {
@@ -96,7 +110,14 @@ then
     
         # cmake deps
         pushd deps/build
-        cmake ..
+        if [[ -z "$FOUND_GTK3_DEV" ]]
+        then
+            echo -e "\nusing GTK2\n"
+            cmake ..
+        else
+            echo -e "\nusing GTK3\n"
+            cmake .. -DDEP_WX_GTK3=ON
+        fi
     
     # &> $ROOT/build/Build.log # Capture all command output
     echo "done"
@@ -113,7 +134,12 @@ then
     
         # rename wxscintilla
         pushd destdir/usr/local/lib
-        cp libwxscintilla-3.1.a libwx_gtk2u_scintilla-3.1.a
+        if [[ -z "$FOUND_GTK3_DEV" ]]
+        then
+            cp libwxscintilla-3.1.a libwx_gtk2u_scintilla-3.1.a
+        else
+            cp libwxscintilla-3.1.a libwx_gtk3u_scintilla-3.1.a
+        fi
         popd
     # &> $ROOT/build/Build.log # Capture all command output
     echo "done"
@@ -133,7 +159,12 @@ then
     
         # cmake
         pushd build
-        cmake .. -DCMAKE_PREFIX_PATH="$PWD/../deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+        if [[ -z "$FOUND_GTK3_DEV" ]]
+        then
+            cmake .. -DCMAKE_PREFIX_PATH="$PWD/../deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+        else
+            cmake .. -DSLIC3R_GTK=3 -DCMAKE_PREFIX_PATH="$PWD/../deps/build/destdir/usr/local" -DSLIC3R_STATIC=1
+        fi
     # &> $ROOT/build/Build.log # Capture all command output
     echo "done"