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# rpm -q pykickstart
pykickstart-1.99.66.6-1.el7.noarch


# ksvalidator ks.cfg 
Ignoring deprecated option on line 15:  The --nobase option has been deprecated and no longer has any effect.  It may be removed from future releases, which will result in a fatal error from kickstart.  Please modify your kickstart file to remove this option.


# cat ks.cfg 
install
lang en_US.UTF-8
keyboard us
network --onboot yes --device eth0 --bootproto dhcp
rootpw  redhat
firewall --disabled
authconfig --enableshadow --passalgo=sha512
selinux --enforcing
timezone America/New_York
clearpart --all --initlabel
autopart

bootloader --disabled

%packages --nocore --nobase --instLangs=bg_BG
httpd
-kernel
%end


I've had pretty much the same results as in 
https://bugzilla.redhat.com/show_bug.cgi?id=1125410#c11

but hit an error with langpacks.conf missing. Either way this bug is VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2285.html