The best AutoCAD 2010 Ubuntu alternative?

Solution 1:

In the free but commercial category, DraftSight is the only native software running on Ubuntu compatible with DWG files - it's 2D only (can view 3D files but not create them), sort of an equivalent to AutoCAD LT. Its native format is DWG v2010.

If you're willing to pay Bricscad is a lot more powerful, has ACIS modeling just like AutoCAD (Pro version) and its Platinum version has even parametric modeling. All that for a fraction of the price of an AutoCAD license.

But in any case, I'm not sure AutoCAD is suitable for aeronautical engineering...

Solution 2:

LibreCad is good I use it myself but to be honest you will struggle to find one as good as AutoCad. When you pay the kind of money that Autocad costs who wouldn't want something extra special.