New answers tagged preseed
I use reprepro to make partial debian mirrors. I use dpkg --get-selections > package.list to select the packages to mirror. You can use the same list for both debian and security repos. https://wiki.debian.org/SettingUpSignedAptRepositoryWithReprepro
It turns out this was caused by the "splash" parameter being passed to the kernel at boot by GRUB. Editing /etc/default/grab and removing splash from GRUB_CMDLINE_LINUX_DEFAULT fixed the problem. I have not yet figured out how to prevent this from happening at install.
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