diff --git a/.travis.yml b/.travis.yml
index c262328..b88f619 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,12 +20,12 @@ jobs:
     - stage: build_docker_images
       script: &build_images
         - |
-          if [ ! $(curl -sflL https://hub.docker.com/v2/repositories/kiwix/kiwix-build_ci/tags/${VARIANT}-${TRAVIS_COMMIT}) ]
+          if [ ! $(curl -sflL https://hub.docker.com/v2/repositories/kiwix/kiwix-build_ci/tags/${VARIANT}-${DOCKER_VERSION}) ]
           then
             echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
             docker build -t kiwix-build_ci -f travis/${VARIANT}_builder.dockerfile .
-            docker tag kiwix-build_ci kiwix/kiwix-build_ci:${VARIANT}-${TRAVIS_COMMIT}
-            docker push kiwix/kiwix-build_ci:${VARIANT}-${TRAVIS_COMMIT}
+            docker tag kiwix-build_ci kiwix/kiwix-build_ci:${VARIANT}-${DOCKER_VERSION}
+            docker push kiwix/kiwix-build_ci:${VARIANT}-${DOCKER_VERSION}
           fi
       env: VARIANT=xenial
     - stage: build_docker_images
@@ -80,7 +80,8 @@ script:
       --mount=type=bind,src=$HOME/EXPORT,dst=/home/ci_builder/EXPORT \
       --mount=type=bind,src=$HOME/.cache,dst=/home/ci_builder/.cache \
       --mount=type=bind,src=$HOME/.gradle/caches,dst=/home/ci_builder/.gradle/caches \
-      kiwix/kiwix-build_ci:${VARIANT}-${TRAVIS_COMMIT}
+      --mount=type=bind,src=$TRAVIS_BUILD_DIR,dst=/home/ci_builder/kiwix-build \
+      kiwix/kiwix-build_ci:${VARIANT}-${DOCKER_VERSION}
   fi
 - if [[ $TRAVIS_OS_NAME != "linux" ]]; then python3 travis/compile_all.py; fi
 after_success:
@@ -105,6 +106,7 @@ env:
   global:
     - NIGHTLY_DATE=$(date +%Y-%m-%d)
     - SSH_KEY=/tmp/private/travisci_builder_id_key
+    - DOCKER_VERSION=1
   matrix:
     - PLATFORM="flatpak" DESKTOP_ONLY=1
     - PLATFORM="native_dyn"
diff --git a/kiwixbuild/builder.py b/kiwixbuild/builder.py
index 4462fd4..b70c139 100644
--- a/kiwixbuild/builder.py
+++ b/kiwixbuild/builder.py
@@ -204,6 +204,7 @@ class Builder:
                     platform.clean_intermediate_directories()
             else:
                 print("SKIP")
-        except StopBuild:
+        except StopBuild as e:
+            print(e)
             sys.exit("Stopping build due to errors")
 
diff --git a/kiwixbuild/dependencies/base.py b/kiwixbuild/dependencies/base.py
index cdbda9a..ba6b1a1 100644
--- a/kiwixbuild/dependencies/base.py
+++ b/kiwixbuild/dependencies/base.py
@@ -446,7 +446,7 @@ class MesonBuilder(Builder):
 
     @property
     def build_type(self):
-        return 'release' if option('make_release') else 'debugoptimized'
+        return 'release' if option('make_release') else 'debug'
 
     @property
     def strip_option(self):
diff --git a/kiwixbuild/platforms/win32.py b/kiwixbuild/platforms/win32.py
index 10e2e20..83c57f4 100644
--- a/kiwixbuild/platforms/win32.py
+++ b/kiwixbuild/platforms/win32.py
@@ -6,10 +6,10 @@ from kiwixbuild._global import neutralEnv
 
 
 class Win32PlatformInfo(PlatformInfo):
-    extra_libs = ['-lwinmm', '-lws2_32', '-lshlwapi', '-lrpcrt4', '-lmsvcr100', '-liphlpapi']
     build = 'win32'
     compatible_hosts = ['fedora', 'debian']
     arch_full = 'i686-w64-mingw32'
+    extra_libs = ['-lwinmm', '-lshlwapi', '-lws2_32']
 
     def get_cross_config(self):
         return {
diff --git a/kiwixbuild/utils.py b/kiwixbuild/utils.py
index 0f2844a..9cbd3f3 100644
--- a/kiwixbuild/utils.py
+++ b/kiwixbuild/utils.py
@@ -127,7 +127,7 @@ def download_remote(what, where):
         print('Sha256 for {} not set, do no verify download'.format(what.name))
     elif what.sha256 != get_sha256(file_path):
         os.remove(file_path)
-        raise StopBuild()
+        raise StopBuild("Sha 256 doesn't correspond")
 
 
 class SkipCommand(Exception):
@@ -135,7 +135,11 @@ class SkipCommand(Exception):
 
 
 class StopBuild(Exception):
-    pass
+    def __init__(self, msg=""):
+        self.msg = msg
+
+    def __str__(self):
+        return self.msg
 
 
 class Remotefile(namedtuple('Remotefile', ('name', 'sha256', 'url'))):
diff --git a/travis/bionic_builder.dockerfile b/travis/bionic_builder.dockerfile
index cde804d..df2298c 100644
--- a/travis/bionic_builder.dockerfile
+++ b/travis/bionic_builder.dockerfile
@@ -29,11 +29,7 @@ USER ci_builder
 WORKDIR /home/ci_builder
 ENV PATH="/home/ci_builder/.local/bin:${PATH}"
 
-# Install kiwix-build
-COPY --chown=ci_builder:ci_builder . kiwix-build
-RUN pip3 install --user -e ./kiwix-build
-
 ENV TRAVIS_BUILD_DIR /home/ci_builder/kiwix-build
 ENV TRAVIS_OS_NAME linux_bionic
 
-CMD kiwix-build/travis/compile_all.py
+CMD pip3 install --user ./kiwix-build && kiwix-build/travis/compile_all.py
diff --git a/travis/compile_all.py b/travis/compile_all.py
index d637598..29a00a5 100755
--- a/travis/compile_all.py
+++ b/travis/compile_all.py
@@ -110,9 +110,11 @@ def run_kiwix_build(target, platform,
     print_message("Build {} (deps={}, release={}, dist={})",
         target, build_deps_only, make_release, make_dist)
     subprocess.check_call(command, cwd=str(HOME))
+    print_message("Build ended")
 
 
 def create_desktop_image():
+    print_message("creating desktop image")
     if make_release:
         postfix = main_project_versions['kiwix-desktop']
         extra_postfix = release_versions.get('kiwix-desktop')
@@ -131,6 +133,7 @@ def create_desktop_image():
     if PLATFORM == 'flatpak':
         build_path = BASE_DIR/'org.kiwix.desktop.flatpak'
         app_name = 'org.kiwix.desktop.{}.flatpak'.format(postfix)
+        print_message("archive is ", build_path)
     else:
         build_path = HOME/'Kiwix-{}-x86_64.AppImage'.format(postfix)
         app_name = "kiwix-desktop_x86_64_{}.appimage".format(postfix)
@@ -253,8 +256,16 @@ def make_flatpak_cache_archive():
         os=TRAVIS_OS_NAME,
         platform=PLATFORM)
     cache = BASE_DIR/'.flatpak-builder'
+    print_message("make flatpak cache archive")
+    nb_files = 0
+    def pseudo_filter(tarinfo):
+        nonlocal nb_files
+        nb_files += 1
+        if (nb_files % 1000) == 0:
+            print('.', flush=True)
+        return tarinfo
     with tarfile.open(str(BASE_EXPORT_DIR/archive_name), 'w:xz') as tar:
-        tar.add(str(cache), arcname=str(cache.relative_to(BASE_DIR)))
+        tar.add(str(cache), arcname=str(cache.relative_to(BASE_DIR)), filter=pseudo_filter)
 
 
 def update_flathub_git():
@@ -264,6 +275,7 @@ def update_flathub_git():
     env['GIT_AUTHOR_EMAIL'] = env['GIT_COMMITTER_EMAIL'] = "kiwixbot@kymeria.fr"
     def call(command, cwd=None):
         cwd = cwd or GIT_REPO_DIR
+        print_message("call ", command)
         subprocess.check_call(command, env=env, cwd=str(cwd))
     command = ['git', 'clone', FLATPAK_HTTP_GIT_REMOTE]
     call(command, cwd=GIT_EXPORT_DIR)
@@ -436,6 +448,7 @@ for target in TARGETS:
     run_kiwix_build(target,
                     platform=PLATFORM,
                     make_release=make_release)
+    print_message("target is ", target)
     if target == 'kiwix-desktop':
         create_desktop_image()
     if make_release and PLATFORM == 'native_dyn' and release_versions.get(target) == 0:
diff --git a/travis/xenial_builder.dockerfile b/travis/xenial_builder.dockerfile
index d84ac01..e826542 100644
--- a/travis/xenial_builder.dockerfile
+++ b/travis/xenial_builder.dockerfile
@@ -22,7 +22,7 @@ RUN apt update -q && \
 #    vim less grep \
   && \
   apt-get clean -y && \
-  rm -rf /var/lib/apt/list/* /usr/share/doc/* /var/cache/debconf/*
+  rm -rf /var/lib/apt/lists/* /usr/share/doc/* /var/cache/debconf/*
 
 # Create user
 RUN useradd --create-home ci_builder
@@ -30,12 +30,8 @@ USER ci_builder
 WORKDIR /home/ci_builder
 ENV PATH="/home/ci_builder/.local/bin:${PATH}"
 
-# Install kiwix-build
-COPY --chown=ci_builder:ci_builder . kiwix-build
-RUN pip3 install --user -e ./kiwix-build
-
 ENV TRAVIS_BUILD_DIR /home/ci_builder/kiwix-build
 ENV GRADLE_USER_HOME /home/ci_builder
 ENV TRAVIS_OS_NAME linux_xenial
 
-CMD kiwix-build/travis/compile_all.py
+CMD pip3 install --user ./kiwix-build && kiwix-build/travis/compile_all.py