A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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I got the Solution . Check out the answer by Afsal...
How can i do that .?.. especially when i can't open any settings menu in unity which is filled with pink color . projects setting , snap settings...
I have installed Unity 3D in my Ubuntu 18.04 . But editor windows are filled with pink color. Only options like file, Accessories are visible....