diff --git a/.github/CI.md b/.github/CI.md
index d9c0d06a2..d69898120 100644
--- a/.github/CI.md
+++ b/.github/CI.md
@@ -15,3 +15,8 @@ configuration, click on the corresponding badge below.
 | ![Full version MS-MPI](https://github.com/FreeFem/FreeFem-sources/actions/workflows/full-msmpi.yml/badge.svg)    | ![Full version MS-MPI](https://github.com/FreeFem/FreeFem-sources/actions/workflows/full-msmpi.yml/badge.svg?branch=develop)    |
 
 GitHub Actions workflows definition files available [here](.github/workflows).
+
+## Triggers
+
+CI worklows are triggered whenever there is a **push on develop or master**
+branches, or when creating a **pull request on develop** branch.
diff --git a/.github/workflows/full-mpich.yml b/.github/workflows/full-mpich.yml
index 8e966db53..d1b5aade7 100644
--- a/.github/workflows/full-mpich.yml
+++ b/.github/workflows/full-mpich.yml
@@ -11,6 +11,31 @@ on:
     branches:
       - develop
 
+  workflow_call:
+    inputs:
+      build-types:
+        description: 'Build types as JSON array'
+        required: false
+        type: string
+        default: '["debug", "release"]'
+      versions:
+        description: 'Ubuntu version as JSON array'
+        required: false
+        type: string
+        default: '[22.04, 24.04]'
+      skip_check:
+        required: false
+        type: boolean
+        default: false
+      skip_macos:
+        required: false
+        type: boolean
+        default: false
+      upload_build_artifacts:
+        required: false
+        type: boolean
+        default: false
+
   # For development phase
   workflow_dispatch:
 
@@ -23,37 +48,45 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [22.04, 24.04]
-        cfg:
-        - {opts: --enable-debug}
-        - {opts: --enable-optim --enable-generic}
+        version:  ${{ fromJson(inputs.versions  || '[22.04, 24.04]') }}
+        build-type: ${{ fromJson(inputs.build-types  || '["debug", "release"]') }}
 
-    name: Ubuntu ${{ matrix.version }} with ${{ matrix.cfg.opts }} \
+    name: Ubuntu ${{ matrix.version }} with ${{ matrix.build-type }} \
             - ${{ github.workflow }}
-
+    env:
+      INSTALL_DIR: /usr/local
     runs-on: ubuntu-${{ matrix.version }}
-
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install
+      - name: Install dependencies
         run: |
           sudo apt update
-          sudo apt install gcc g++ gfortran m4 patch git wget cmake \
-          libhdf5-dev flex bison autoconf automake \
-          autotools-dev
+          sudo apt install -y gcc g++ gfortran m4 patch git wget cmake \
+          libhdf5-dev flex bison autoconf automake unzip patch \
+          autotools-dev python3 freeglut3-dev
+
+      - name: Set configure flags and variables
+        id: flags
+        run: |
+          if [ "${{ matrix.build-type }}" = "debug" ]; then
+            echo "configure-flags=--enable-debug" >> $GITHUB_OUTPUT
+          elif [ "${{ matrix.build-type }}" = "release" ]; then
+            echo "configure-flags=--enable-optim --enable-generic" >> $GITHUB_OUTPUT
+          fi
+          echo "staging-dir=${{ github.workspace }}/install_staging" >> $GITHUB_OUTPUT
 
       - name: Configure
         run: |
           autoreconf -i
-          ./configure --enable-download ${{ matrix.cfg.opts }} \
-          --prefix="${HOME}/freefem"
+          ./configure --enable-download ${{ steps.flags.outputs.configure-flags }} \
+          --prefix="$INSTALL_DIR"
           ./3rdparty/getall -a -o PETSc
 
       - name: PETSc
         run: |
           cd 3rdparty/ff-petsc
-          make petsc-slepc
+          sudo make petsc-slepc
           cd -
           ./reconfigure
 
@@ -67,22 +100,43 @@ jobs:
             config.log
           compression-level: 9
 
+        # Weird problem of permission on libfftw3.la without sudo
       - name: Build
-        run: make -j 4
+        run: sudo make -j 4
 
       - name: Check
+        if: ${{ inputs.skip_check == false }}
         run: |
           make check -i
           ./etc/actions/failed_tests_logs.sh
 
-      - name: Install
-        run: make install
+      - name: Install to staging directory
+        if: ${{ inputs.upload_build_artifacts == true }}
+        run: |
+          mkdir -p ${{ steps.flags.outputs.staging-dir }}/$INSTALL_DIR
+          sudo make install DESTDIR=${{ steps.flags.outputs.staging-dir }}
+          sudo cp -r $INSTALL_DIR/ff-petsc ${{ steps.flags.outputs.staging-dir }}/$INSTALL_DIR
+          
+      - name: Tar to keep permission when upload/download
+        if: ${{ inputs.upload_build_artifacts == true }}
+        run: |
+          cd ${{ steps.flags.outputs.staging-dir }}/${{ env.INSTALL_DIR }}
+          tar -czf ${{ github.workspace }}/install_tree.tar.gz .
+        
+      - name: Upload
+        if: ${{ inputs.upload_build_artifacts == true }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: install_tree_${{ matrix.version }}
+          path: install_tree.tar.gz
+          retention-days: 1
 
   macos:
+    if: ${{ inputs.skip_macos == false }}
     strategy:
       fail-fast: false
       matrix:
-        version: [13, 14, 15]
+        version: [14, 15]
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
diff --git a/.github/workflows/full-openmpi.yml b/.github/workflows/full-openmpi.yml
index e65886f44..39545d406 100644
--- a/.github/workflows/full-openmpi.yml
+++ b/.github/workflows/full-openmpi.yml
@@ -11,6 +11,27 @@ on:
     branches:
       - develop
 
+  workflow_call:
+    inputs:
+      build-types:
+        description: 'Build types as JSON array'
+        required: false
+        type: string
+        default: '["debug", "release"]'
+      versions:
+        description: 'Ubuntu version as JSON array'
+        required: false
+        type: string
+        default: '[22.04, 24.04]'
+      skip_check:
+        required: false
+        type: boolean
+        default: false
+      upload_build_artifacts:
+        required: false
+        type: boolean
+        default: false
+        
   # For development phase
   workflow_dispatch:
 
@@ -23,37 +44,45 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [22.04, 24.04]
-        cfg:
-        - {opts: --enable-debug}
-        - {opts: --enable-optim --enable-generic}
+        version:  ${{ fromJson(inputs.versions  || '[22.04, 24.04]') }}
+        build-type: ${{ fromJson(inputs.build-types  || '["debug", "release"]') }}
 
-    name: Ubuntu ${{ matrix.version }} with ${{ matrix.cfg.opts }} \
+    name: Ubuntu ${{ matrix.version }} with ${{ matrix.build-type }} \
             - ${{ github.workflow }}
-
+    env:
+      INSTALL_DIR: /usr/local
     runs-on: ubuntu-${{ matrix.version }}
-
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install
+      - name: Install dependencies
         run: |
           sudo apt update
-          sudo apt install gcc g++ gfortran m4 patch git wget cmake \
-          libhdf5-dev flex bison autoconf automake \
-          autotools-dev libopenmpi-dev
+          sudo apt install -y gcc g++ gfortran m4 patch git wget cmake \
+          libhdf5-dev flex bison autoconf automake unzip patch \
+          autotools-dev libopenmpi-dev python3 freeglut3-dev
+
+      - name: Set configure flags and variables
+        id: flags
+        run: |
+          if [ "${{ matrix.build-type }}" = "debug" ]; then
+            echo "configure-flags=--enable-debug" >> $GITHUB_OUTPUT
+          elif [ "${{ matrix.build-type }}" = "release" ]; then
+            echo "configure-flags=--enable-optim --enable-generic" >> $GITHUB_OUTPUT
+          fi
+          echo "staging-dir=${{ github.workspace }}/install_staging" >> $GITHUB_OUTPUT
 
       - name: Configure
         run: |
           autoreconf -i
-          ./configure --enable-download ${{ matrix.cfg.opts }} \
-          --prefix="${HOME}/freefem"
+          ./configure --enable-download ${{ steps.flags.outputs.configure-flags }} \
+          --prefix="$INSTALL_DIR"
           ./3rdparty/getall -a -o PETSc
 
       - name: PETSc
         run: |
           cd 3rdparty/ff-petsc
-          make petsc-slepc
+          sudo make petsc-slepc
           cd -
           ./reconfigure
 
@@ -67,15 +96,35 @@ jobs:
             config.log
           compression-level: 9
 
+        # Weird problem of permission on libfftw3.la without sudo
       - name: Build
-        run: make -j 4
+        run: sudo make -j 4
 
       - name: Check
+        if: ${{ inputs.skip_check == false }}
         run: |
           make check -i
           ./etc/actions/failed_tests_logs.sh
 
-      - name: Install
-        run: make install
+      - name: Install to staging directory
+        if: ${{ inputs.upload_build_artifacts == true }}
+        run: |
+          mkdir -p ${{ steps.flags.outputs.staging-dir }}/$INSTALL_DIR
+          sudo make install DESTDIR=${{ steps.flags.outputs.staging-dir }}
+          sudo cp -r $INSTALL_DIR/ff-petsc ${{ steps.flags.outputs.staging-dir }}/$INSTALL_DIR
+          
+      - name: Tar to keep permission when upload/download
+        if: ${{ inputs.upload_build_artifacts == true }}
+        run: |
+          cd ${{ steps.flags.outputs.staging-dir }}/${{ env.INSTALL_DIR }}
+          tar -czf ${{ github.workspace }}/install_tree.tar.gz .
+        
+      - name: Upload
+        if: ${{ inputs.upload_build_artifacts == true }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: install_tree_${{ matrix.version }}
+          path: install_tree.tar.gz
+          retention-days: 1
 
 # No test for macOS, the homebrew bottle open-mpi seems broken.
diff --git a/.github/workflows/minimal.yml b/.github/workflows/minimal.yml
index 75d189697..f7c045f85 100644
--- a/.github/workflows/minimal.yml
+++ b/.github/workflows/minimal.yml
@@ -58,7 +58,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [13, 14, 15]
+        version: [14, 15]
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
diff --git a/.github/workflows/release_deb.yml b/.github/workflows/release_deb.yml
new file mode 100644
index 000000000..0bf36d62b
--- /dev/null
+++ b/.github/workflows/release_deb.yml
@@ -0,0 +1,128 @@
+# Call the corresponding build workflow with the proper arguments:
+# - Build_type: Release
+# - Upload build_tree: true
+name: Release DEB
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build_freefem:
+    uses: ./.github/workflows/full-mpich.yml
+    with:
+      versions: '[22.04, 24.04]'
+      build-types: '["release"]'
+      skip_check: true
+      skip_macos: true
+      upload_build_artifacts: true
+
+  package_freefem_2204:
+    needs: build_freefem
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Extract version, tag and .deb file name
+        id: version
+        run: |
+          VERSION=$(grep AC_INIT configure.ac | cut -d"," -f2 | cut -d"[" -f2 | cut -d"]" -f1)
+          RELEASE_TAG_NAME="v$VERSION"
+          OSRELEASE=$(lsb_release -r|awk '{print $2}')
+          GH_DEB_NAME="FreeFEM-${VERSION}-amd64-ubuntu${OSRELEASE}.deb"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "release_tag_name=$RELEASE_TAG_NAME" >> $GITHUB_OUTPUT
+          echo "gh_deb_name=$GH_DEB_NAME" >> $GITHUB_OUTPUT
+          echo "Version: $VERSION"
+          echo "Release tag name: $RELEASE_TAG_NAME"
+          echo "Package name: $GH_DEB_NAME"
+          
+      - uses: actions/download-artifact@v5
+        with:
+          name: install_tree_22.04
+          path: ./artifacts
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          
+      - name: Untar artifact and package .deb
+        run: |
+          mkdir ./install_tree
+          tar -xzf ./artifacts/install_tree.tar.gz -C ./install_tree/
+          bash etc/actions/releases/package_deb_ubuntu.sh \
+          ./install_tree \
+          ${{ steps.version.outputs.version }}
+          
+      - name: Upload .deb as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.version.outputs.release_tag_name }}-22.04
+          path: ./*.deb
+
+  package_freefem_2404:
+    needs: build_freefem
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Extract version, tag and .deb file name
+        id: version
+        run: |
+          VERSION=$(grep AC_INIT configure.ac | cut -d"," -f2 | cut -d"[" -f2 | cut -d"]" -f1)
+          RELEASE_TAG_NAME="v$VERSION"
+          OSRELEASE=$(lsb_release -r|awk '{print $2}')
+          GH_DEB_NAME="FreeFEM-${VERSION}-amd64-ubuntu${OSRELEASE}.deb"
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          echo "release_tag_name=$RELEASE_TAG_NAME" >> $GITHUB_OUTPUT
+          echo "gh_deb_name=$GH_DEB_NAME" >> $GITHUB_OUTPUT
+          echo "Version: $VERSION"
+          echo "Release tag name: $RELEASE_TAG_NAME"
+          echo "Package name: $GH_DEB_NAME"
+          
+      - uses: actions/download-artifact@v5
+        with:
+          name: install_tree_24.04
+          path: ./artifacts
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          
+      - name: Unta artifact and package .deb
+        run: |
+          mkdir ./install_tree
+          tar -xzf ./artifacts/install_tree.tar.gz -C ./install_tree/
+          bash etc/actions/releases/package_deb_ubuntu.sh \
+          ./install_tree \
+          ${{ steps.version.outputs.version }}
+          
+      - name: Upload .deb as artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ steps.version.outputs.release_tag_name }}-24.04
+          path: ./*.deb
+
+
+  create_release:
+    needs: [package_freefem_2204, package_freefem_2404]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write  # Required to create releases
+    steps:
+      - name: Download all .deb packages
+        uses: actions/download-artifact@v4
+        with:
+          path: ./release-assets
+          merge-multiple: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          
+      - name: Untar the artifact
+        run:  find ./release-assets -name "*.tar.gz" -exec tar -xzf {} -C ./release-assets \;
+        
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: ./release-assets/*.deb
+          draft: false
+          prerelease: false
+          # generate_release_notes: true
+          tag_name: ${{ github.ref_name }}  # Should automatically uses the tag
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/sequential.yml b/.github/workflows/sequential.yml
index 61e3f4dfb..f970682e1 100644
--- a/.github/workflows/sequential.yml
+++ b/.github/workflows/sequential.yml
@@ -60,7 +60,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [13, 14, 15]
+        version: [14, 15]
         cfg:
         - {opts: --enable-debug}
         - {opts: --enable-optim --enable-generic}
diff --git a/etc/actions/releases/package_deb_ubuntu.sh b/etc/actions/releases/package_deb_ubuntu.sh
new file mode 100644
index 000000000..ad52da121
--- /dev/null
+++ b/etc/actions/releases/package_deb_ubuntu.sh
@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+# Provided install tree (DESTDIR/usr/local) of FreeFEM, this scripts builds a DEB
+# package of FreeFem and store it in GH_DEB_NAME
+#
+# Example for v4.16 on Ubuntu 24.04:
+# FreeFEM-4.16-amd64-ubuntu24.04.deb
+
+set -x
+set -u
+set -e
+
+## Parameters
+
+INSTALL_TREE=$1
+VERSION=$2
+
+# TOKEN=$1
+#ORGANIZATION="simonlegrand"
+REPOSITORY="FreeFem-sources"
+#VERSION=$(grep AC_INIT configure.ac | cut -d"," -f2 | cut -d"[" -f2 | cut -d"]" -f1)
+#RELEASE_TAG_NAME="v$VERSION"
+OSRELEASE=$(lsb_release -r|awk '{print $2}')
+
+
+DEB_NAME="freefem-${VERSION}-amd64-ubuntu${OSRELEASE}"
+GH_DEB_NAME="FreeFEM-${VERSION}-amd64-ubuntu${OSRELEASE}.deb"
+
+## Create FreeFEM Debian package
+mkdir "$DEB_NAME"
+mkdir "$DEB_NAME/DEBIAN"
+touch "$DEB_NAME/DEBIAN/control"
+{
+	echo "Package: freefem";
+	echo "Version: $VERSION";
+	echo "Section: custom";
+	echo "Architecture: amd64";
+	echo "Depends: libc6 (>= 2.31), g++ (>= 9.3), gcc (>= 9.3), gfortran (>= 9.3), libgsl-dev (>=2.5), libhdf5-dev (>=1.10.4), liblapack-dev (>= 3.9), freeglut3-dev (>= 2.8.1)";
+	echo "Maintainer: FreeFEM, Frédéric Hecht <frederic.hecht@sorbonne-universite.fr>";
+	echo "Description: FreeFEM, Finite Element Language software";
+	echo "Homepage: https://freefem.org"
+} >> "$DEB_NAME/DEBIAN/control"
+mkdir -p "$DEB_NAME/usr/local/share/FreeFEM"
+mkdir -p "$DEB_NAME/usr/local/bin"
+mkdir -p "$DEB_NAME/usr/local/lib/ff++"
+mkdir -p "$DEB_NAME/usr/share/doc/freefem"
+
+cp -r "$INSTALL_TREE/lib/ff++/$VERSION" "$DEB_NAME/usr/local/lib/ff++/$VERSION"
+cp -r "$INSTALL_TREE/ff-petsc/" "$DEB_NAME/usr/local/ff-petsc"
+cp -r "$INSTALL_TREE/share/FreeFEM/$VERSION" "$DEB_NAME/usr/local/share/FreeFEM/$VERSION"
+cp -r "$INSTALL_TREE/bin/FreeFem++" "$DEB_NAME/usr/local/bin/FreeFem++"
+cp -r "$INSTALL_TREE/bin/FreeFem++-mpi" "$DEB_NAME/usr/local/bin/FreeFem++-mpi"
+cp -r "$INSTALL_TREE/bin/FreeFem++-nw" "$DEB_NAME/usr/local/bin/FreeFem++-nw"
+cp -r "$INSTALL_TREE/bin/bamg" "$DEB_NAME/usr/local/bin/bamg"
+cp -r "$INSTALL_TREE/bin/cvmsh2" "$DEB_NAME/usr/local/bin/cvmsh2"
+cp -r "$INSTALL_TREE/bin/ff-c++" "$DEB_NAME/usr/local/bin/ff-c++"
+cp -r "$INSTALL_TREE/bin/ff-get-dep" "$DEB_NAME/usr/local/bin/ff-get-dep"
+cp -r "$INSTALL_TREE/bin/ff-mpirun" "$DEB_NAME/usr/local/bin/ff-mpirun"
+cp -r "$INSTALL_TREE/bin/ff-pkg-download" "$DEB_NAME/usr/local/bin/ff-pkg-download"
+cp -r "$INSTALL_TREE/bin/ffglut" "$DEB_NAME/usr/local/bin/ffglut"
+cp -r "$INSTALL_TREE/bin/ffmaster" "$DEB_NAME/usr/local/bin/ffmaster"
+cp -r "$INSTALL_TREE/bin/ffmedit" "$DEB_NAME/usr/local/bin/ffmedit"
+cp AUTHORS "$DEB_NAME/usr/share/doc/freefem/AUTHOR"
+cp README.md "$DEB_NAME/usr/share/doc/freefem/README.md"
+
+dpkg-deb --build "$DEB_NAME/"
+mv "$DEB_NAME.deb" "$GH_DEB_NAME"