Missing `python3-gi-cairo` when installing .deb version

[igormcsouza]

When I installed the .deb version from here on my Ubuntu 24.04 and I notice the application was freezing all the time and sometimes even crashing.. I inspected the errors/logs and noticed an error popping up many times

Traceback (most recent call last):

  File "/usr/lib/webapp-manager/webapp-manager.py", line 222, in data_func_surface

    surface = Gdk.cairo_surface_create_from_pixbuf(pixbuf, self.window.get_scale_factor())

              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

TypeError: Couldn't find foreign struct converter for 'cairo.Surface'

I figured that when I install the GObject Introspection bridge the error got solved.. For the record here is the commands to install it...

sudo apt update
sudo apt install python3-gi-cairo

I can verify with

python3 -c "from gi.repository import Gdk; import cairo; print('Bridge is working!')"

The solution for this is to add the package as dependency of the .deb or at least document this correctly!