Fix /etc/default/isc-dhcp-server helps: Mar 29 17:13:41 mn-wifidhcp02 systemd[1]: Started ISC DHCP IPv4 server. Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Internet Systems Consortium DHCP Server 4.3.5 Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Copyright 2004-2016 Internet Systems Consortium. Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: All rights reserved. Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: For info, please visit https://www.isc.org/software/dhcp/ Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Config file: /etc/dhcp/dhcpd.conf Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Database file: /var/lib/dhcp/dhcpd.leases Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: PID file: /run/dhcp-server/dhcpd.pid Mar 29 17:13:41 mn-wifidhcp02 systemd[1]: Reloading. Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Wrote 10210 leases to leases file. Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Listening on LPF/enp0s8.257/08:00:27:4d:fb:20/Guest Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Sending on LPF/enp0s8.257/08:00:27:4d:fb:20/Guest Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Listening on LPF/enp0s8.256/08:00:27:4d:fb:20/Employee Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Sending on LPF/enp0s8.256/08:00:27:4d:fb:20/Employee Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Listening on LPF/enp0s8.255/08:00:27:4d:fb:20/Guest-YYY Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Sending on LPF/enp0s8.255/08:00:27:4d:fb:20/Guest-YYY Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Listening on LPF/enp0s8.252/08:00:27:4d:fb:20/Guest-XXX Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Sending on LPF/enp0s8.252/08:00:27:4d:fb:20/Guest-XXX Mar 29 17:13:41 mn-wifidhcp02 sh[13678]: Sending on Socket/fallback/fallback-net
-- 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/1921750 Title: ISC DHCP Server 4.3.5-3ubuntu7.2 stops working Status in isc-dhcp package in Ubuntu: New Bug description: After updating isc-dhcp-server from 4.3.5-3ubuntu7.1 to 4.3.5-3ubuntu7.2 dhcpd failed to start After downgrade dhcpd still working # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 18.04.5 LTS Release: 18.04 Codename: bionic # apt-cache policy isc-dhcp-server isc-dhcp-server: Installed: 4.3.5-3ubuntu7.1 Candidate: 4.3.5-3ubuntu7.2 Version table: 4.3.5-3ubuntu7.2 500 500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages *** 4.3.5-3ubuntu7.1 500 500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 100 /var/lib/dpkg/status 4.3.5-3ubuntu7 500 500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages I expect dhcpd running But it fqailed to start, reporting about bond0 interface, but there is no bond0 on the server # ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:e0:29:c2 brd ff:ff:ff:ff:ff:ff 3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:4d:fb:20 brd ff:ff:ff:ff:ff:ff 4: enp0s8.252@enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:4d:fb:20 brd ff:ff:ff:ff:ff:ff 5: enp0s8.198@enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:4d:fb:20 brd ff:ff:ff:ff:ff:ff 6: enp0s8.255@enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:4d:fb:20 brd ff:ff:ff:ff:ff:ff 7: enp0s8.256@enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:4d:fb:20 brd ff:ff:ff:ff:ff:ff 8: enp0s8.257@enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000 link/ether 08:00:27:4d:fb:20 brd ff:ff:ff:ff:ff:ff syslog following: Mar 29 16:32:55 mn-wifidhcp02 systemd[1]: isc-dhcp-server6.service: Failed with result 'exit-code'. Mar 29 16:32:55 mn-wifidhcp02 systemd[1]: Reloading. Mar 29 16:32:55 mn-wifidhcp02 systemd[1]: Started ISC DHCP IPv4 server. Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: Internet Systems Consortium DHCP Server 4.3.5 Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: Copyright 2004-2016 Internet Systems Consortium. Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: All rights reserved. Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: For info, please visit https://www.isc.org/software/dhcp/ Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: Config file: /etc/dhcp/dhcpd.conf Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: Database file: /var/lib/dhcp/dhcpd.leases Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: PID file: /run/dhcp-server/dhcpd.pid Mar 29 16:32:55 mn-wifidhcp02 systemd[1]: Reloading. Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: Wrote 10210 leases to leases file. Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: No subnet declaration for bond1.257 (no IPv4 addresses). Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: ** Ignoring requests on bond1.257. If this is not what Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: you want, please write a subnet declaration Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: in your dhcpd.conf file for the network segment Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: to which interface bond1.257 is attached. ** Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: No subnet declaration for bond1.256 (no IPv4 addresses). Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: ** Ignoring requests on bond1.256. If this is not what Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: you want, please write a subnet declaration Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: in your dhcpd.conf file for the network segment Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: to which interface bond1.256 is attached. ** Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: No subnet declaration for bond1.255 (no IPv4 addresses). Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: ** Ignoring requests on bond1.255. If this is not what Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: you want, please write a subnet declaration Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: in your dhcpd.conf file for the network segment Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: to which interface bond1.255 is attached. ** Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: No subnet declaration for bond1.252 (no IPv4 addresses). Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: ** Ignoring requests on bond1.252. If this is not what Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: you want, please write a subnet declaration Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: in your dhcpd.conf file for the network segment Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: to which interface bond1.252 is attached. ** Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: Not configured to listen on any interfaces! Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: If you think you have received this message due to a bug rather Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: than a configuration issue please read the section on submitting Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: bugs on either our web page at www.isc.org or in the README file Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: before submitting a bug. These pages explain the proper Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: process and the information we find helpful for debugging.. Mar 29 16:32:55 mn-wifidhcp02 sh[1369]: exiting. Mar 29 16:32:55 mn-wifidhcp02 systemd[1]: isc-dhcp-server.service: Main process exited, code=exited, status=1/FAILURE Mar 29 16:32:55 mn-wifidhcp02 systemd[1]: isc-dhcp-server.service: Failed with result 'exit-code'. 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