Is there a good LEGO instructions manual creator for Ubuntu? I can't seem to find one.
Also, are there any online ones?
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In case you have made your model with LDraw based software with all necessary steps already you can use LPub3d to create building instructions. There is a bit of a learning curve to make your instructions look right with required features. But then it makes them look almost like made by LEGO.
There is even an Ubuntu native *.deb package available to download. No need to compile from source.