I've got the same problem on my home dapper system. This computer is an old PII 400 MHz machine with a nearly dead mainboard battery.
I found a couple of other similar bugs: 44166 44737 The info in bug #44166 suggests a problem with networking startup scripts during the boot process. -- ntpdate occasionally not run https://launchpad.net/bugs/53886 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs