I randomly checked the amount of entropy, please note in advance that haveged was currently installed!
root@Turris_JB:~# cat /proc/sys/kernel/random/entropy_avail
256
root@Turris_JB:~#
Nevertheless, check the installation and launch of the application
Package haveged (1.9.18-1) installed in root is up to date.
root@Turris_JB:~# /etc/init.d/haveged enable && /etc/init.d/haveged start
root@Turris_JB:~# ^C
root@Turris_JB:~# cat /proc/sys/kernel/random/entropy_avail
256