Issue still exists with fresh installation of 16.04 server. rolly@head:~$ apt-show-versions | grep isc-dhcp-server isc-dhcp-server:amd64/xenial-updates 4.3.3-5ubuntu12.6 uptodate
it works with the solution: sudo ln -s /etc/apparmor.d/usr.sbin.dhcpd /etc/apparmor.d/disable/ sudo apparmor_parser -R /etc/apparmor.d/usr.sbin.dhcpd I am running dhcpd on infiniband, ipoib on ib0, here is the working output: rolly@head:~$ sudo service isc-dhcp-server status [sudo] password for rolly: ● isc-dhcp-server.service - ISC DHCP IPv4 server Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; disabled; vendor preset: enabled) Active: active (running) since Mon 2017-01-09 22:05:34 HKT; 19min ago Docs: man:dhcpd(8) Main PID: 5173 (dhcpd) Tasks: 1 Memory: 9.0M CPU: 25ms CGroup: /system.slice/isc-dhcp-server.service └─5173 dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf ib0 Jan 09 22:05:34 head dhcpd[5173]: All rights reserved. Jan 09 22:05:34 head dhcpd[5173]: For info, please visit https://www.isc.org/software/dhcp/ Jan 09 22:05:34 head dhcpd[5173]: Wrote 0 leases to leases file. Jan 09 22:05:34 head dhcpd[5173]: Listening on LPF/ib0//192.168.0.0/24 Jan 09 22:05:34 head sh[5173]: Listening on LPF/ib0//192.168.0.0/24 Jan 09 22:05:34 head sh[5173]: Sending on LPF/ib0//192.168.0.0/24 Jan 09 22:05:34 head sh[5173]: Sending on Socket/fallback/fallback-net Jan 09 22:05:34 head dhcpd[5173]: Sending on LPF/ib0//192.168.0.0/24 Jan 09 22:05:34 head dhcpd[5173]: Sending on Socket/fallback/fallback-net Jan 09 22:05:34 head dhcpd[5173]: Server starting service. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1543794 Title: isc-dhcp-server fails to start on second & further attempts with 'Can't open /var/lib/dhcp/dhcpd.leases for append' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1543794/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs