This is ever-so-similar to ID 5524 as the result is the
same, but the circumstances are different.

The graphical installer hangs during post-installation
configuration if:

  1. Timezone selection is done from "UTC Offset" tab
  2. Selected Zone is "UTC-06:00 U.S.Central"
  3. "Use Daylight Saving Time" checkbox is *not* selected

The error reported on tty1 is:

  OSError [Errno 2] No such file or directory:
'/mnt/sysimage/usr/share/zoneinfo/UTC-06:00'

This following about a page of tracebacks, which I didn't
write down. I can reproduce this error 100% of the time
under the circumstances listed above, so retrieving the
traceback info should not be a problem if it is necessary.

(By the way, is there some reason RedHat decided to leave
Dallas off of the time zone config map? There is nothing but
a big blank area where Texas is.)