Posted by joaclint on Jun 30, 2012; 8:57pm
URL: https://forum.librecad.org/Updates-for-2-0-Ubuntu-do-not-distinguish-the-thicknesses-of-the-lines-SOLVED-tp5706783p5706836.html

OMG!!!
Yes, it was... Draft Mode was enabled. May be one update checked it automatically.
Now it is all ok.