current.html has no instructions to remove the _lkm group yet.
Index: www/faq/current.html
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RCS file: /cvs/www/faq/current.html,v
retrieving revision 1.562
diff -u -p -r1.562 current.html
--- www/faq/current.html 19 Oct 2014 13:21:42 -0000 1.562
+++ www/faq/current.html 20 Oct 2014 23:38:08 -0000
@@ -914,6 +914,10 @@ and the lkm directory should be deleted:
rm -f /usr/share/man/man4/lkm.4
rm -f /usr/share/mk/bsd.lkm.mk /usr/include/sys/lkm.h
</pre>
+Also, the group _lkm should be removed:
+<pre>
+ groupdel _lkm
+</pre>
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