No Internet after upgrading to 12.10

Question

I upgraded to Quantic yesterday; it runs on a Macbook Pro. After using boot-repair to be able to boot to Ubuntu (via live CD), I found myself without any connection to Internet, be it with ethernet or wireless.

When I try a ping ubuntu.com from the default Ubuntu terminal, the only answer I get is ping: unknown host ubuntu.com.

Here is a list of facts:

• The computer is a macbook pro ("MacBookPro3,1" with sudo dmidecode -s system-product-name);
• Internet is provided through a router (with Tomato on it);
• Local network works fine: I can ping other devices, mount NAS volumes via fstab, etc.
• Other devices can connect to Internet; this is how I can write this question.
• I searched on askubuntu.com and other websites, but everything I tried end up with no luck.

Any help would be much appreciated! :)

Here is what a lspci -nnk gives me:

  Subsystem: Apple Inc. Device [106b:00a0]
00:01.0 PCI bridge [0604]: Intel Corporation Mobile PM965/GM965/GL960 PCI Express Root Port [8086:2a01] (rev 03)
  Kernel driver in use: pcieport
  Kernel modules: shpchp
00:1a.0 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 [8086:2834] (rev 03)
  Kernel driver in use: uhci_hcd
00:1a.1 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 [8086:2835] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: uhci_hcd
00:1a.7 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 [8086:283a] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: ehci_hcd
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio Controller [8086:284b] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: snd_hda_intel
  Kernel modules: snd-hda-intel
00:1c.0 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 [8086:283f] (rev 03)
  Kernel driver in use: pcieport
  Kernel modules: shpchp
00:1c.2 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 3 [8086:2843] (rev 03)
  Kernel driver in use: pcieport
  Kernel modules: shpchp
00:1c.4 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 [8086:2847] (rev 03)
  Kernel driver in use: pcieport
  Kernel modules: shpchp
00:1c.5 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 [8086:2849] (rev 03)
  Kernel driver in use: pcieport
  Kernel modules: shpchp
00:1d.0 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 [8086:2830] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: uhci_hcd
00:1d.1 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 [8086:2831] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: uhci_hcd
00:1d.2 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 [8086:2832] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: uhci_hcd
00:1d.7 USB controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 [8086:2836] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: ehci_hcd
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev f3)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801HM (ICH8M) LPC Interface Controller [8086:2815] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel modules: lpc_ich
00:1f.1 IDE interface [0101]: Intel Corporation 82801HM/HEM (ICH8M/ICH8M-E) IDE Controller [8086:2850] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: ata_piix
00:1f.2 IDE interface [0101]: Intel Corporation 82801HM/HEM (ICH8M/ICH8M-E) SATA Controller [IDE mode] [8086:2828] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: ata_piix
00:1f.3 SMBus [0c05]: Intel Corporation 82801H (ICH8 Family) SMBus Controller [8086:283e] (rev 03)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel modules: i2c-i801
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G84 [GeForce 8600M GT] [10de:0407] (rev a1)
  Subsystem: Apple Inc. Device [106b:00a0]
  Kernel driver in use: nvidia
  Kernel modules: nvidia_current, nouveau, nvidiafb
0b:00.0 Network controller [0280]: Atheros Communications Inc. AR5418 Wireless Network Adapter [AR5008E 802.11(a)bgn] (PCI-Express) [168c:0024] (rev 01)
  Subsystem: Apple Inc. AR5BXB72 802.11abgn Mini PCIe Card [AR5008E-3NX] [106b:0087]
  Kernel driver in use: ath9k
  Kernel modules: ath9k
0c:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8058 PCI-E Gigabit Ethernet Controller [11ab:436a] (rev 13)
  Subsystem: Marvell Technology Group Ltd. Imac 8,1 Wired Ethernet Adapter [11ab:00ba]
  Kernel driver in use: sky2
  Kernel modules: sky2
0d:03.0 FireWire (IEEE 1394) [0c00]: Texas Instruments TSB82AA2 IEEE-1394b Link Layer Controller [104c:8025] (rev 02)
  Kernel driver in use: firewire_ohci
  Kernel modules: firewire-ohci

Solution 1

I had the same problem and resolved it by disabling dnsmask. Run:

gksu gedit /etc/NetworkManager/NetworkManager.conf

And comment the dns=dnsmaaq line appearing in:

[main]
plugins=ifupdown,keyfile
dns=dnsmasq

Comment it out by writing # before it:

[main]
plugins=ifupdown,keyfile
#dns=dnsmasq

Then, to apply your changes, reboot or restart networking.

Solution 2

I finally found my way around the problem. I don't know if this is the right thing to do, but it worked for me. Here's what I did, based on the informations found at Network Configuration > Dynamic IP Address Assignment (DHCP Client):

I opened "/etc/network/interfaces" with vi:

sudo vi /etc/network/interfaces

The actual state was of the file was:

auto lo
iface lo inet loopback

I changed it to dhcp because I'm using a router as DHCP server:

auto eth0
iface eth0 inet dhcp

I also restarted the "networking" service with:

sudo restart networking

Then I had Internet back. :)

I don't exactly know why this file would have changed while upgrading to 12.10. Maybe some other logic has changed and this was a side effect; I can't tell. You can try this out first if you encounter a similar problem though.

Solution 3

Looks like this is a known issue:

Launchpad bug#1051348