How and where can I change the default system font? For now it appears to be DejaVu 11, which looks horrible on my laptop.
I mean the font that is used in menus or labels. For example when I open Firefox for the first time or any KDE application for the first time (Konsole, Okular, etc) all menus and labels are drawn using DejaVu 11. Chromium appears to be using its own font. The font used for menus and label doesn't appear to be changeable from the application itself so I guess there must be some system-wide setting. Does it depend on the window manager? I am using Lumina at this moment.
It could be related to GTK or similar UI framework, do they have system-wide font configuration files?