Joachim Osnabryg schrieb:
http://wiki.lyx.org/Layouts/Tufte-handout - under "Files that are now part of LyX"
> But with this layout, the "abstract" environment of the > tufte-handout.cls cannot be chosen by the LyX-GUI, it is not there.
This has been fixed two days ago. Please download the layout file again from this Wiki page to get the latest version.