Ubudao-Style icons designed by WalentyWalewski, he worked really hard on this theme and this icon set look nice & elegant on desktop with every kind theme doesn't matter it is dark or light. This icon set is designed for Gnome, Unity, KDE, Xfce and LXDE environments. If you found any missing icon you can report to creator by going to source link and hopefully they will fix it. Current version offers more than 4000+ icons. You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change icons. Also check icons collection.
