Answer by N0rbert for Error while opening application via terminal?
For me it seems that you have edited some theme CSS files (as gtk-main.css from Radiance theme). You can reinstall them with: sudo apt-get install --reinstall light-themes
View ArticleError while opening application via terminal?
When I open any application like firefox from terminal, it opens but before that in the terminal it shows (firefox:2292): Gtk-WARNING **: 16:20:38.765: Theme parsing error: gtk-main.css:73:38: Failed...
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