diff --git a/packages/python.cmake b/packages/python.cmake
index 4e960383e..4d78889a4 100644
--- a/packages/python.cmake
+++ b/packages/python.cmake
@@ -1,80 +1,80 @@
 #===============================================================================
 # @file   python_interpreter.cmake
 #
 # @author Nicolas Richart <nicolas.richart@epfl.ch>
 #
 # @date creation: Wed Oct 31 2018
 # @date last modification: Wed Oct 31 2018
 #
 # @brief  packages description for the external dependency to the python interpreted
 #
 #
 # @section LICENSE
 #
 # Copyright (©) 2018-2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
 # Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
 #
 # Akantu is free software: you can redistribute it and/or modify it under the
 # terms of the GNU Lesser General Public License as published by the Free
 # Software Foundation, either version 3 of the License, or (at your option) any
 # later version.
 # 
 # Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 # A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 # details.
 # 
 # You should have received a copy of the GNU Lesser General Public License along
 # with Akantu. If not, see <http://www.gnu.org/licenses/>.
 #
 #===============================================================================
 if(FALSE AND CMAKE_VERSION VERSION_GREATER 3.21)
   if (PYTHON_EXECUTABLE)
     get_filename_component(_python_bin_dir "${PYTHON_EXECUTABLE}" DIRECTORY)
     get_filename_component(_python_root_dir "${_python_bin_dir}" DIRECTORY)
     set(Python_ROOT_DIR "${_python_bin_dir}" CACHE INTERNAL "")
     message(STATUS "Python hint: ${Python_ROOT_DIR}")
   endif()
 
 
   package_declare(Python EXTERNAL DESCRIPTION "Akantu's python dependency"
     EXTRA_PACKAGE_OPTIONS ARGS
     COMPONENTS Interpreter;Development
     )
 
   package_on_enabled_script(Python
     "set(Python_SITELIB \${Python_SITELIB} CACHE INTERNAL \"\")
 set(Python_EXECUTABLE \${Python_EXECUTABLE} CACHE INTERNAL \"\")
 set(Python_INCLUDE_DIRS \${Python_INCLUDE_DIRS} CACHE INTERNAL \"\")
 set(Python_VERSION_MAJOR \${Python_VERSION_MAJOR} CACHE INTERNAL \"\")
 set(Python_VERSION_MINOR \${Python_VERSION_MINOR} CACHE INTERNAL \"\")
 ")
 else()
-  if (PYTHON_LIBRARY MATCHES "\.a$")
+  if (PYTHON_LIBRARY MATCHES "\\.a$")
     set(PYTHON_LIBRARY NOTFOUND CACHE INTERNAL "")
   endif()
   package_declare(Python ADVANCED META DESCRIPTION "Akantu's python dependency"
     DEPENDS PythonLibsNew PythonInterp
     )
 
   package_declare(PythonInterp EXTERNAL
     DESCRIPTION "Akantu's python Interpreter"
     )
 
   package_on_enabled_script(PythonInterp
     "set(Python_EXECUTABLE \${PYTHON_EXECUTABLE} CACHE INTERNAL \"\")")
 
   package_declare(PythonLibsNew EXTERNAL
     DESCRIPTION "Akantu's python Development"
     )
 
   package_on_enabled_script(PythonLibsNew
     "set(Python_INCLUDE_DIRS \${PYTHON_INCLUDE_DIRS} CACHE INTERNAL \"\")
 set(Python_VERSION_MAJOR \${PYTHON_VERSION_MAJOR} CACHE INTERNAL \"\")
 set(Python_VERSION_MINOR \${PYTHON_VERSION_MINOR} CACHE INTERNAL \"\")
 ")
 
   # package_declare(Numpy EXTERNAL
   #   DESCRIPTION "Akantu's python Numpy"
   #   )
 endif()
diff --git a/test/ci/debian:testing/Dockerfile b/test/ci/debian:testing/Dockerfile
index 1d1a948b7..c2aa0b8f9 100644
--- a/test/ci/debian:testing/Dockerfile
+++ b/test/ci/debian:testing/Dockerfile
@@ -1,38 +1,38 @@
 FROM debian:testing
 MAINTAINER Nicolas Richart <nicolas.richart@epfl.ch>
 
 # library dependencies
-RUN apt-get -qq update && apt-get -qq -y install \
+RUN apt -qq update && apt -qq -y install \
     g++ gfortran clang cmake \
     openmpi-bin libmumps-dev libscotch-dev \
     libboost-dev libopenblas-dev \
     python3 python3-dev python3-numpy python3-scipy python3-mpi4py \
     && rm -rf /var/lib/apt/lists/*
 
 # for documentation
-RUN apt-get -qq update && apt-get -qq -y install \
+RUN apt -qq update && apt -qq -y install \
     python3-sphinx \
     python3-sphinxcontrib.bibtex \
     python3-sphinx-rtd-theme \
     python3-breathe \
     python3-git python3-jinja2 \
     doxygen graphviz \
     && rm -rf /var/lib/apt/lists/*
 
 # for ci
-RUN apt-get -qq update && apt-get -qq -y install \
+RUN apt -qq update && apt -qq -y install \
     gmsh python3-pytest python3-click python3-termcolor \
     ccache clang-format python3-flake8 python3-pip clang-tidy \
     curl git xsltproc jq \
     gcovr llvm binutils \
     ninja-build \
     && rm -rf /var/lib/apt/lists/*
 
 RUN pip3 install warning_parser
 
 COPY .openmpi /root/.openmpi
 
 # for debug
-RUN apt-get -qq update && apt-get -qq -y install \
+RUN apt -qq update && apt -qq -y install \
     gdb valgrind \
     && rm -rf /var/lib/apt/lists/*