/usr/share/ltsp/plugins/ltsp-build-client/Debian/010-debconf-frontend is in ltsp-server 5.5.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | case "$MODE" in
configure)
# Provide an environment variable for ltsp-client-builder to select the
# passthrough frontend, without making it an official ltsp-build-client
# option, so that DEBIAN_FRONTEND defaults to noninteractive.
if [ -n "$LTSP_CLIENT_BUILDER" ]; then
unset DEBIAN_HAS_FRONTEND
unset DEBCONF_FRONTEND
unset DEBCONF_REDIR
# Avoid debconf mailing notes.
export DEBCONF_ADMIN_EMAIL=""
export DEBCONF_READFD=0
export DEBCONF_WRITEFD=3
export DEBIAN_FRONTEND=passthrough
else
export DEBIAN_FRONTEND=noninteractive
fi
;;
esac
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