# can use debconf-get-selections to inspect auto-prompt values for a package
debconf-get-selections |grep gravwell

# debconfs for gravwell using defaults
echo "debconf gravwell/ingestPrompt select 'Generate secret' "| sudo debconf-set-selections
echo "debconf gravwell/controlPrompt select 'Generate secret' "| sudo debconf-set-selections
echo "debconf gravwell/EULA-accept boolean true "| sudo debconf-set-selections
echo "debconf gravwell/EULA-display note "| sudo debconf-set-selections
echo "debconf gravwell/searchAgentPrompt select 'Generate secret'" | sudo debconf-set-selections

# now install
apt-get install gravwell