Ubuntu – Cannot access Internet after 14.04 upgrade

I upgraded from 13.10 to 14.04 a couple of days ago via internet using "sudo apt-get upgrade".

After the upgrade, both my wired connection and wireless connection stopped talking to the internet when using Firefox or Chrome.

I do not have any problem exchanging files with another PC (running Ubuntu 10.04) use Filezilla within the same network and am able to use Firefox to log into my router to check configuration.

What is so strange was the system appeared to be able to reach out to internet to download files when I run "sudo apt-get update".

I am really baffled by this. Any help to get me back my internet access for both wired/wireless connections would be appreciated.

Here's some information about my settings (wireless intentionally disabled when this snapshot is taken):

The unit is a ThinkPad T60.
ifconfig:
eth0  Link encap:Ethernet  HWaddr 00:15:58:7d:17:04  
      inet addr:192.168.1.102  Bcast:192.168.1.255  Mask:255.255.255.0
      inet6 addr: fe80::215:58ff:fe7d:1704/64 Scope:Link
      UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
      RX packets:162 errors:0 dropped:0 overruns:0 frame:0
      TX packets:167 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:50700 (50.7 KB)  TX bytes:24254 (24.2 KB)
      Interrupt:16 Memory:ee000000-ee020000 

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:65536  Metric:1
      RX packets:228 errors:0 dropped:0 overruns:0 frame:0
      TX packets:228 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:0 
      RX bytes:57669 (57.6 KB)  TX bytes:57669 (57.6 KB)

sudo lshw -C network:
*-network               
      description: Ethernet interface
      product: 82573L Gigabit Ethernet Controller
      vendor: Intel Corporation
      physical id: 0
      bus info: pci@0000:02:00.0
      logical name: eth0
      version: 00
      serial: 00:15:58:7d:17:04
      size: 100Mbit/s
      capacity: 1Gbit/s
      width: 32 bits
      clock: 33MHz
      capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt    10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
      configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=2.3.2-k duplex=full firmware=0.5-1 ip=192.168.1.102 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
      resources: irq:45 memory:ee000000-ee01ffff ioport:3000(size=32)
 *-network DISABLED
      description: Wireless interface
      product: PRO/Wireless 3945ABG [Golan] Network Connection
      vendor: Intel Corporation
      physical id: 0
      bus info: pci@0000:03:00.0
      logical name: wlan0
      version: 02
      serial: 00:18:de:b8:b1:c2
      width: 32 bits
      clock: 33MHz
      capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
      configuration: broadcast=yes driver=iwl3945 driverversion=3.13.0-24-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11abg
      resources: irq:47 memory:edf00000-edf00fff


route -n  (revised using dhcp):
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface 
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     1      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     9      0        0 wlan0