Install and run FlatCAM on modern linux distros

flatcam-install.sh

#!/bin/bash

# clone flatcam beta
git clone -b Beta https://bitbucket.org/jpcgt/flatcam.git flatcam-beta

# grab the python 3.8 AppImage
wget https://github.com/niess/python-appimage/releases/download/python3.8/python3.8.19-cp38-cp38-manylinux1_x86_64.AppImage

# make it executable
chmod +x python3.8.19-cp38-cp38-manylinux1_x86_64.AppImage

# create a short name utility link to the AppImage
ln -s python3.8.19-cp38-cp38-manylinux1_x86_64.AppImage py38

# create a virtual environment
./py38 -m venv .venv

# activate the environment
source .venv/bin/activate

# build GDAL manually, as probably the system has a newer version
wget https://github.com/OSGeo/gdal/releases/download/v3.3.3/gdal-3.3.3.tar.gz

tar -xvzf gdal-3.3.3.tar.gz

pushd gdal-3.3.3

./configure --with-python=$(which python) --prefix=$VIRTUAL_ENV

make -j$(nproc)

pushd swig/python/

python setup.py install

popd
popd

# override the requirements to working ones
cat << 'EOT' > requirements.txt
pyqt5>=5.15
numpy~=1.16
matplotlib==3.1.3
cycler~=0.10
python-dateutil~=2.1
kiwisolver~=1.1
six~=1.0
setuptools
dill~=0.3
rtree~=1.3
pyopengl~=3.0
vispy==0.7.0
ortools~=7.0
svg.path~=4.0
simplejson~=3.19
shapely~=1.7.0
freetype-py~=2.5
fontTools~=4.55
rasterio~=1.3
lxml~=5.3
ezdxf~=1.1
qrcode~=6.1
reportlab~=3.5
svglib~=1.5
#gdal~=3.3 #installed manually
pyserial~=3.4
protobuf~=3.20
EOT

# install them
pip install -r requirements.txt

# now you can launch FlatCAM
# .venv/bin/python flatcam-beta/FlatCAM.py

EugenioBonifacio, many thanks for sharing this, it has been of great help. Ihakov2, many thanks for your suggestions, I have the same problem like you and fixed as suggested.

Thanks again to both, now it works great.