New answers tagged license
Just copy the file Unity_v5.x.ulf to drive_c/users/Public/Application Data/unity in your wine folder. If there is no such folder in that path so create. It should works!
There is no single license for Ubuntu. Ubuntu is a distribution of thousands of different packages that each have their own license. For example the Linux Kernel itself is released under the GPLv2, but other components like some binary drivers that may come with Ubuntu are proprietary. This page explains this a bit further.
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