Since Gnome 40, you cannot change window theme via gnome-tweaks. You have to mess around with gtk.css file and manually edit it. I am sure there is easier way but I never looked into it.
Do you know of a different Desktop Environment that allows for more of a pure black theme?
Other than gnome, I don't think there is any DE that restrict theming. You can go with Plasma, if you want to use GTK theme then there is Budgie, Cinnamon and Xfce.
Fun fact: Budgie on Solus used to be default using Plata-Noir which is material design inspired theme with pure black color scheme. It is not anymore becase the theme got unmaintained.
I just REALLY want a pure black theme and apparently Gnome with Ubuntu is not the answer
Just install XFce (no need to reinstall the OS). XFce is very themeable.
Nwg-look can change all the theme settings at once. Check it out
I'm not sure about GTK4 but for GTK2 you use ~/.gtkrc-2.0 and for GTK3 ~/.config/gtk-3.0/settings.ini
GTK2/3 Normal apps are the legacy theme, Flatpaks in GTK3 need their own thing, and Flatpaks in GTK4 need an override. Then for GTK4 system apps you need to override the system theme. adw-override can do it i think but ive never done it before so do some research first if u try it.
Have you installed the gnome-themes gnome extensions ? Once installed you can change the theme. Notice that shell theme and app themes are not the same thing. Also, notice that you need to take a gtk theme that supports gtk3 and gtk4 if you are using recent gnome
Allegedly I am using the right one. It works to change the Gnome shell but not the GTK themes
There is one for Flathub apps that needs to be installed on Flathub, one for old GTK apps, and one for newer GTK apps I think
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