A couple of days ago, I upgraded to not only Ubuntu 12.04 LTS, but also from kernel 3.0.0.17 to 3.2.0.24. This worked correctly at my friends house just fine. However, I flew home and now my computer cannot ping or connect to the internet at all. (Both of these were wireless networks). I switched to my windows partition of my computer, and it connected to the internet no issues.
So the problem was isolated to ubuntu.
My computer is a Dell Studio XPS which is about 3 years old now. The WiFi adapter is an Intel WiFi Link 5300. This will play into the game later.
After a couple of hours searching around and talking to people, a few things were unearthed. First, that a dhcp lease was obtained from the router. Other than that, the computer could not communicate with anything on the network (no ping even). All of the /etc/hosts, /etc/hostname, and /etc/network/interfaces stuff was in order. There was nothing abnormal in any of the logs that were checked.
With the help of some googling, someone pointed out that it sounded remarkably like what was happening in this thread. DHCP lease acquired, no transmission after that. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/420678
This was for the Intel Wifi Link 5300. That is my adapter. It must be conflicting between the G and N standards from the Linksys WRT310N router here at home, and it must not have had that conflict at the previous house I was at. I booted into a previous version of the kernel (3.0.0.17) and there was no issue (that's actually how I'm typing this right now). I performed a "sudo apt-get --reinstall install linux-image-3.2.0-24-generic" to make sure the kernel was correct, and the error repeated after a restart. Once again, I booted into the previous version of the kernel, and it worked correctly.
If there is any differing conclusion about what happened, feel free to let me know!
Just to verify the version claim, my "lsb_release -rd" output is:
Description: Ubuntu 12.04 LTS
Release: 12.04
Here is the "lspci -vvxxx" result for the network adapter:
04:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300
Subsystem: Intel Corporation Device 1121
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 47
Region 0: Memory at f8000000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlagn
Kernel modules: iwlagn
00: 86 80 35 42 06 01 10 00 00 00 80 02 10 00 00 00
10: 04 00 00 f8 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 21 11
30: 00 00 00 00 c8 00 00 00 00 00 00 00 0a 01 00 00
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: adam 1833 F.... pulseaudio
/dev/snd/controlC0: adam 1833 F.... pulseaudio
/dev/snd/pcmC0D0p: adam 1833 F...m pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xfc400000 irq 47'
Mixer name : 'IDT 92HD73C1X5'
Components : 'HDA:111d7675,10280272,00100103'
Controls : 16
Simple ctrls : 10
Card1.Amixer.info:
Card hw:1 'HDMI'/'HDA ATI HDMI at 0xcfeec000 irq 48'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100100'
Controls : 4
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
DistroRelease: Ubuntu 12.04
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: Dell Inc. Studio XPS 1640
NonfreeKernelModules: fglrx
Package: linux (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-17-generic root=UUID=F4FE6024FE5FDE04 loop=/ubuntu/disks/root.disk ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
RelatedPackageVersions:
linux-restricted-modules-3.0.0-17-generic N/A
linux-backports-modules-3.0.0-17-generic N/A
linux-firmware 1.79
SourcePackage: linux
Tags: precise precise
Uname: Linux 3.0.0-17-generic x86_64
UpgradeStatus: Upgraded to precise on 2012-05-06 (4 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 03/29/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0Y536R
dmi.board.vendor: Dell Inc.
dmi.board.version: A14
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A14
dmi.modalias: dmi:bvnDellInc.:bvrA14:bd03/29/2010:svnDellInc.:pnStudioXPS1640:pvrA143:rvnDellInc.:rn0Y536R:rvrA14:cvnDellInc.:ct8:cvrA14:
dmi.product.name: Studio XPS 1640
dmi.product.version: A143
dmi.sys.vendor: Dell Inc.
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