The /etc/apparmor.d/usr.sbin.dhcpd profile in 16.04 includes the line:
/var/lib/dhcp/dhcpd{,6}.leases* lrw,
So there should be no issue with manipulation of the leases file.
The systemd unit in 16.04 also includes a 'chown' command to ensure the
right ownership of the leases file, so there should be no need for any
dac override.
Are you somehow running an Ubuntu 16.04 system with upstart as the init
instead of systemd? This is what the user in
https://bugs.launchpad.net/ubuntu/+source/isc-
dhcp/+bug/1543794/comments/8 appears to have, and this is not supported.
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https://bugs.launchpad.net/bugs/1186662
Title:
isc-dhcp-server fails to renew lease file
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