I've been experiencing this irritation for the last year and a half and I've finally diagnosed it.
The problem seems to be that the log line emitted by dhclient has changed since the logcheck pattern was written. A sample log line is: Oct 11 07:22:55 mythtv dhclient: DHCPREQUEST of 192.168.1.2 on eth0 to 192.168.1.1 port 67 (xid=0x2e36de11) The current pattern in /etc/logcheck/ignore.d.server/dhclient is: ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: DHCP(REQUEST|RELEASE) (of [.0-9]{7,15} )?on [[:alnum:].-]+ to [.0-9]{7,15} port 67$ This doesn't match the final xid section of the log line, so the line should be updated to something like the following: ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ dhclient(-2.2.x)?: DHCP(REQUEST|RELEASE) (of [.0-9]{7,15} )?on [[:alnum:].-]+ to [.0-9]{7,15} port 67 (\(xid=0x[[:alnum:]]+\))?$ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1134592 Title: isc-dhcp 4.2.4-5's DHCPREQUEST messages no longer match ignore regex To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/logcheck/+bug/1134592/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs