W: Module path /usr/share/linstaller/linstaller/core/../modules/language/front/glade/module.glade does not exist! Skipping...
W: Module path /usr/share/linstaller/linstaller/core/../modules/timezone/front/glade/module.glade does not exist! Skipping...
This is wierd, it shouldn't be looking for modules at .../linstaller/core
/../modules/module_name, but in ../linstaller/modules/module_name.
Might be a setup.py issue, although looking at it shows no obvious fault.
I'll investigate further, but in the mean time, I think the best way would be to use installer packages from our repo, or even better clone the git and build them.
git clone https://gitlab.com/trios-linux/trios-installer.git && cd trios-installer
sudo apt-get install debhelper dh-python dpkg-dev devscripts && dpkg-buildpackage -uc -us
sudo debi # to install the built pkgs
If packages work, then it must be something related to setup.py.
Btw, GTK errors are safe to ignore, as long as there are no problems ( crashing, missing widgets etc... ). They are mostly caused by the "crazy" Gnome crew and constant non-backward compatible changes they make in gtk3...