Public bug reported:

This is Ubuntu 12.10

Start-Date: 2013-04-22  20:48:32
Commandline: apt-get --assume-yes dist-upgrade
Upgrade: isc-dhcp-client:i386 (4.2.4-1ubuntu10.1, 4.2.4-1ubuntu10.2), 
isc-dhcp-common:i386 (4.2.4-1ubuntu10.1, 4.2.4-1ubuntu10.2), 
isc-dhcp-server:i386 (4.2.4-1ubuntu10.1, 4.2.4-1ubuntu10.2)
End-Date: 2013-04-22  20:49:28

I forced a downgrade to the previous packages 
isc-dhcp-client_4.2.4-1ubuntu10.1_i386.deb
isc-dhcp-common_4.2.4-1ubuntu10.1_i386.deb 
isc-dhcp-server_4.2.4-1ubuntu10.1_i386.deb and it is working now.

Here a few of the log entries from when it was working to when it
stopped working:


Apr 22 20:27:57 io dhcpd: DHCPACK to 192.168.2.98 (00:1f:d0:d0:ed:50) via eth1
Apr 22 20:38:00 io dhcpd: DHCPINFORM from 192.168.2.98 via eth1
Apr 22 20:38:00 io dhcpd: DHCPACK to 192.168.2.98 (00:1f:d0:d0:ed:50) via eth1
Apr 22 20:48:02 io dhcpd: DHCPINFORM from 192.168.2.98 via eth1
Apr 22 20:48:02 io dhcpd: DHCPACK to 192.168.2.98 (00:1f:d0:d0:ed:50) via eth1
Apr 22 20:49:21 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 31 leases to leases file.
Apr 22 20:49:21 io dhcpd: Open a socket for LPF: Permission denied
Apr 22 20:49:21 io kernel: [168459.938698] type=1400 audit(1366678161.188:42): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2443 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 22 20:49:21 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 31 leases to leases file.
Apr 22 20:49:21 io dhcpd: Open a socket for LPF: Permission denied
Apr 22 20:49:21 io kernel: [168460.091513] type=1400 audit(1366678161.340:43): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2482 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 22 20:49:21 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 31 leases to leases file.
Apr 22 20:49:21 io dhcpd: Open a socket for LPF: Permission denied
Apr 22 20:49:21 io kernel: [168460.404076] type=1400 audit(1366678161.656:44): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2491 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 22 20:49:21 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 31 leases to leases file.
Apr 22 20:49:21 io dhcpd: Open a socket for LPF: Permission denied
Apr 22 20:49:21 io kernel: [168460.487047] type=1400 audit(1366678161.736:45): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2498 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 22 20:49:21 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 22 20:49:21 io dhcpd: Wrote 31 leases to leases file.
Apr 22 20:49:21 io dhcpd: Open a socket for LPF: Permission denied


pr 23 07:14:39 io dhcpd: Wrote 31 leases to leases file.
Apr 23 07:14:40 io dhcpd: Open a socket for LPF: Permission denied
Apr 23 07:14:40 io kernel: [   49.077715] type=1400 audit(1366715680.165:46): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=1817 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 23 07:14:40 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 23 07:14:40 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 23 07:14:40 io dhcpd: Wrote 31 leases to leases file.
Apr 23 07:14:40 io dhcpd: Open a socket for LPF: Permission denied
Apr 23 07:14:40 io kernel: [   49.248752] type=1400 audit(1366715680.337:47): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=1892 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 23 07:14:40 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 23 07:14:40 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 23 07:14:40 io dhcpd: Wrote 31 leases to leases file.
Apr 23 07:14:40 io dhcpd: Open a socket for LPF: Permission denied
Apr 23 07:14:40 io kernel: [   49.509316] type=1400 audit(1366715680.597:48): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2101 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 23 07:14:40 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 23 07:14:40 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 23 07:14:40 io dhcpd: Wrote 31 leases to leases file.
Apr 23 07:14:41 io dhcpd: Open a socket for LPF: Permission denied
Apr 23 07:14:41 io kernel: [   49.956465] type=1400 audit(1366715681.045:49): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2119 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 23 07:14:41 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 23 07:14:41 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 23 07:14:41 io dhcpd: Wrote 31 leases to leases file.
Apr 23 07:14:41 io dhcpd: Open a socket for LPF: Permission denied
Apr 23 07:14:41 io kernel: [   50.147287] type=1400 audit(1366715681.237:50): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2139 comm="dhcpd" family="packet" sock_type="raw" protocol=768
Apr 23 07:14:41 io dhcpd: Wrote 0 deleted host decls to leases file.
Apr 23 07:14:41 io dhcpd: Wrote 0 new dynamic host decls to leases file.
Apr 23 07:14:41 io dhcpd: Wrote 31 leases to leases file.
Apr 23 07:14:41 io dhcpd: Open a socket for LPF: Permission denied
Apr 23 07:14:41 io kernel: [   50.332243] type=1400 audit(1366715681.421:51): 
apparmor="DENIED" operation="create" parent=1 profile="/usr/sbin/dhcpd" 
pid=2154 comm="dhcpd" family="packet" sock_type="raw" protocol=768

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1171838

Title:
  Last nights isc-dhcp-server update fails to start

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