The Ubuntu 16.04 x86_64 puppetagain kickstart option does not boot the kernel like the other kickstart options. No error is given, just a quick refresh of the menu.
It looks like the sync script on the admin host is failing due to missing images on mrepo. Both Ubuntu-14.04.1-x86_64-server/ and Ubuntu-14.04.1-i386-server/ were missing. Although there is a 14.04.4 directory for both. The script has '-e' set so it is failing to sync the rest of the images including '16.04.1'. I hashed the kernel and initrd image to see if the directory had been renamed but the hashes didn't match up to the existing kernel and images still on the admin hosts. [firstname.lastname@example.org images]$ sha1sum Ubuntu-14.04.4-i386-server/linux 846e462647963664baaea853d17e9a8c19fca4d2 Ubuntu-14.04.4-i386-server/linux [email@example.com images]$ sha1sum Ubuntu-14.04.4-i386-server/initrd.gz aadf4b80338ef9618686452ffce08c9a70bf9a30 Ubuntu-14.04.4-i386-server/initrd.gz [firstname.lastname@example.org images]$ sha1sum Ubuntu-14.04.1-i386-server/linux ece9b1ad238d75b6168626fe2d88bab6462f798b Ubuntu-14.04.1-i386-server/linux [email@example.com images]$ sha1sum Ubuntu-14.04.1-i386-server/initrd.gz 06b49b30734ba14a4f8ec766d782ddde46606cac Ubuntu-14.04.1-i386-server/initrd.gz I've fixed this by rsyncing the missing images back to mrepo and manually exec '/usr/local/sbin/sync-images.sh' on both admin1a and admin1b All images are sync'd correctly now and the 16.04 kickstart option fires up.