What are the free engines for creating a cross-platform 2D game under ubuntu with sale rights?

Question

Mobile development

Tell me the engine for creating a 2D game with sale rights or with internal purchases under linux ubuntu.
I saw such ones on the net, but there are a lot of restrictions, so you can’t sell them.
Of the restrictions, all that scares is the number of allowed sounds and pictures, the rest is tolerable.
The game should work under the Android OS and other mobile systems if possible.

Answer 1

How did you get it already, by God.

Answer 2

There is also libgdx .