I have installed graphics driver on my droplet having Fedora 19, but if I open any application having GUI or access some graphics related libraries from my deployed application it gives an error "Gtk-WARNING **: cannot open display". X server is also not starting. It gives following error: (EE) Fatal server error: (EE) xf86OpenConsole: VT_ACTIVATE failed: No such device or address (EE) (EE) Please consult the Fedora Project support at http://wiki.x.org for help. (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information. (EE) (EE) Server terminated with error (1). Closing log file. xinit: giving up xinit: unable to connect to X server: Connection refused xinit: server error