The output in comment #8 shows that this system is running upstart despite being 16.04. Upstart is not supported as init on 16.04 except during the upgrade. This bug appears to have been fixed for the systemd unit, but not for the upstart job. A simple reboot to systemd should suffice to fix the problem on 16.04.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to isc-dhcp in 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' Status in isc-dhcp package in Ubuntu: Fix Released Bug description: During the first start of isc-dhcp-server (using the systemd service unit), a blank dhcpd.leases file is created (presumably owned by root:root). dhcpd starts successfully (and then exits due to no subnet definitions, that's expected). Attempting to start the service again fails with 'Can't open /var/lib/dhcp/dhcpd.leases for append' (the dhcpd.leases file ownership is now dhcpd.dhcpd), and apparmor logs a denial of the dac_override capability. Removing the leases file repeats this process (first start works as expected, future ones do not). ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: isc-dhcp-server 4.3.3-5ubuntu4 ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0 Uname: Linux 4.4.0-2-generic x86_64 ApportVersion: 2.19.4-0ubuntu2 Architecture: amd64 Date: Tue Feb 9 20:58:12 2016 InstallationDate: Installed on 2016-02-09 (0 days ago) InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160206) ProcEnviron: LANGUAGE=en_GB:en TERM=linux PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: isc-dhcp UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1543794/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
