Eth0 dead after Ubuntu update

After I installed the Ubuntu updates (inc. kernel) this morning, my
ethernet interface has gone dead. This is what I get when I run
ifconfig:

> eth0      Link encap:Ethernet  HWaddr 00:1f:d0:af:30:27  
>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>           Interrupt:32 Base address:0x8000 
> 
> lo        Link encap:Local Loopback  
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:230 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:230 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:13858 (13.8 KB)  TX bytes:13858 (13.8 KB)
> 
> virbr0    Link encap:Ethernet  HWaddr 7e:bc:c8:6a:97:ec  
>           inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
>           inet6 addr: fe80::7cbc:c8ff:fe6a:97ec/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:27 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:0 (0.0 B)  TX bytes:4625 (4.6 KB)


I pulled this from daemon.log:

> Sep 30 22:04:19 thoth avahi-daemon[1055]: Found user 'avahi' (UID 110) and group 'avahi' (GID 121).
> Sep 30 22:04:19 thoth NetworkManager: <info>  starting...
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Successfully dropped root privileges.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: avahi-daemon 0.6.25 starting up.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Successfully called chroot().
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Successfully dropped remaining capabilities.
> Sep 30 22:04:19 thoth NetworkManager: <info>  Trying to start the modem-manager...
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: init!
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: update_system_hostname
> Sep 30 22:04:19 thoth NetworkManager:    SCPluginIfupdown: management mode: unmanaged
> Sep 30 22:04:19 thoth avahi-daemon[1055]: No service file found in /etc/avahi/services.
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1c.4/0000:08:00.0/net/eth0, iface: eth0)
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1c.4/0000:08:00.0/net/eth0, iface: eth0): no ifupdown configuration found.
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/lo, iface: lo)
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/lo, iface: lo): no ifupdown configuration found.
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: end _init.
> Sep 30 22:04:19 thoth NetworkManager: Loaded plugin ifupdown: (C) 2008 Canonical Ltd.  To report bugs please use the NetworkManager mailing list.
> Sep 30 22:04:19 thoth NetworkManager: Loaded plugin keyfile: (c) 2007 - 2008 Red Hat, Inc.  To report bugs please use the NetworkManager mailing list.
> Sep 30 22:04:19 thoth NetworkManager: <info>  WiFi enabled by radio killswitch; enabled by state file
> Sep 30 22:04:19 thoth NetworkManager: <info>  WWAN enabled by radio killswitch; enabled by state file
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: (12245280) ... get_connections.
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: (12245280) ... get_connections (managed=false): return empty list.
> Sep 30 22:04:19 thoth NetworkManager:    Ifupdown: get unmanaged devices count: 0
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): carrier is OFF
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): new Ethernet device (driver: 'r8169')
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): now managed
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): device state change: 1 -> 2 (reason 2)
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): bringing up device.
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): preparing device.
> Sep 30 22:04:19 thoth NetworkManager: <info>  (eth0): deactivating device (reason: 2).
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Network interface enumeration completed.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Registering HINFO record with values 'X86_64'/'LINUX'.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Server startup complete. Host name is thoth.local. Local service cookie is 3474948992.
> Sep 30 22:04:19 thoth NetworkManager: <info>  modem-manager is now available
> Sep 30 22:04:19 thoth NetworkManager: <WARN>  default_adapter_cb(): bluez error getting default adapter: The name org.bluez was not provided by any .service files
> Sep 30 22:04:19 thoth NetworkManager: <info>  Trying to start the supplicant...
> Sep 30 22:04:19 thoth NetworkManager: <WARN>  device_creator(): /sys/devices/virtual/net/virbr0: couldn't determine device driver; ignoring...
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/virbr0, iface: virbr0)
> Sep 30 22:04:19 thoth NetworkManager:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/virbr0, iface: virbr0): no ifupdown configuration found.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Joining mDNS multicast group on interface virbr0.IPv4 with address 192.168.122.1.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: New relevant interface virbr0.IPv4 for mDNS.
> Sep 30 22:04:19 thoth avahi-daemon[1055]: Registering new address record for 192.168.122.1 on virbr0.IPv4.
> Sep 30 22:04:21 thoth avahi-daemon[1055]: Registering new address record for fe80::7cbc:c8ff:fe6a:97ec on virbr0.*.

Is this some sort of problem with DHCP  or a hardware failure? Ifconfig
says that interface eth0 is "UP", but it doesn't have an IP address
assigned. The router that is the computer's DHCP server seems to be
working fine, but does not show the computer even being connected to it.
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