Build the ISO without updating the chroot via FAI. This option is useful for
example when working on stable releases: if you have a working base
system/chroot and do not want to execute any further updates (via "-u" option)
-but intend to only build the ISO. (Notice: This option requires a feature within
-FAI which is not yet part of the official FAI release yet.)
+but intend to only build the ISO.
-c **CLASSES**::