I can confirm that I am seeing this same behavior. The proposed fix also worked for me.
-- 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/1901373 Title: isc-dhcp-server AppArmor Denied on /proc/sys/net/ipv4/ip_local_port_range Status in isc-dhcp package in Ubuntu: Confirmed Bug description: The following AppArmor denial errors are shown on startup: Oct 25 00:52:00 xxx kernel: [ 556.231990] audit: type=1400 audit(1603601520.710:32): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=1982 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 Oct 25 00:52:00 xxx kernel: [ 556.232257] audit: type=1400 audit(1603601520.710:33): apparmor="DENIED" operation="open" profile="/usr/sbin/dhcpd" name="/proc/sys/net/ipv4/ip_local_port_range" pid=1982 comm="dhcpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0 Fix is to edit /etc/apparmor.d/local/usr.sbin.dhcpd to have: @{PROC}/sys/net/ipv4/ip_local_port_range r, 'lsb_release -rd': Description: Ubuntu 20.04.1 LTS Release: 20.04 isc-dhcp-server: Installed: 4.4.1-2.1ubuntu5 Candidate: 4.4.1-2.1ubuntu5 Version table: *** 4.4.1-2.1ubuntu5 500 500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages 100 /var/lib/dpkg/status apparmor: Installed: 2.13.3-7ubuntu5.1 Candidate: 2.13.3-7ubuntu5.1 Version table: *** 2.13.3-7ubuntu5.1 500 500 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 100 /var/lib/dpkg/status 2.13.3-7ubuntu5 500 500 http://us.archive.ubuntu.com/ubuntu focal/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1901373/+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
