There is not an AutoCAD for linux because linux is normaly share free....There are quite a few applications that open *.dwg files; this one from Open Design Alliance I have repacked for Porteus 5.0 is working Ok for me. Normally I use Porteus KDE for all my work, but whenever I had to open an Acad file, I had to shutdown and start MSW to at least view the file

My last version from this converted application was v22.3 and it was downloaded by potential *.dwg users 136 times...not bad

Meanwhile the application has been actualized many times and the most recent version is by date v.24.1.
You can downoad my revision from Mediafire by opening this link.
I have not tried it in other Desktops, but I guess it should run all right
Enjoy!