No internet connection with 4.2.0-30

Bug #1549029 reported by William T. Lowther on 2016-02-23
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

Ubuntu 15.10: After updrading to Linux 4.2.0-30-generic this morning via Software Updater, I cannot connect to internet (hardwire-I do not have wireless). After reverting back to 4.2.0-27- generic, the internet connection is restored. Same results from repeated attempts. TIA, Bill
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
 /dev/snd/controlC0: bill 1430 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=8f7336ed-d5c8-42ff-988b-28a309d092cb
InstallationDate: Installed on 2015-11-06 (121 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
 eth0 no wireless extensions.

 lo no wireless extensions.
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 0bda:0153 Realtek Semiconductor Corp. Mass Storage Device
 Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
 Bus 001 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire XC-603
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-27-generic.efi.signed root=UUID=a3501911-54f9-411d-a777-18d2fbe4e467 ro
ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
 linux-restricted-modules-4.2.0-27-generic N/A
 linux-backports-modules-4.2.0-27-generic N/A
 linux-firmware 1.149.3

Tags: wily
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.2.0-27-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio avahi avahi-autoipd backup bin bluetooth cdrom colord crontab daemon dialout dip disk fax floppy fuse games gnats input irc kmem lightdm list lp lpadmin mail man messagebus mlocate netdev news nopasswdlogin operator plugdev proxy pulse pulse-access rtkit sambashare saned sasl scanner shadow src ssh ssl-cert staff sudo sys syslog systemd-bus-proxy systemd-journal systemd-journal-remote systemd-network systemd-resolve systemd-timesync tape tty users utempter utmp uucp uuidd video voice whoopsie www-data
_MarkForUpload: True 09/15/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P11-B4 Aspire XC-603
dmi.board.vendor: Acer
dmi.chassis.type: 3
dmi.chassis.vendor: Acer
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP11-B4:bd09/15/2015:svnAcer:pnAspireXC-603:pvr:rvnAcer:rnAspireXC-603:rvr:cvnAcer:ct3:cvr: Aspire XC-603
dmi.sys.vendor: Acer

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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tags: added: bot-comment
tags: added: regression-update
affects: ubuntu → linux (Ubuntu)

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1549029

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
William T. Lowther (624wtl) wrote :

I have been asked by automated email to run "apport-collect 1549029". I cannot connect to my Launchpad acct. with the 4.2.0-30-generic upgrade installed. I can do so with 4.2.0-27-generic installed. Do you want me to run "apport-collect 1549029" with the later installed?

Changed in linux (Ubuntu):
status: Incomplete → Confirmed
Joseph Salisbury (jsalisbury) wrote :

I'd like to perform a kernel bisect to figure out which commit caused this regression. We need to identify the earliest kernel that did not exhibit the bug and the first kernel that did exhibit the bug.

Can you test the following kernels and post back?

You don't have to test every kernel, just up until the first kernel that has this bug.

Thanks in advance!

Changed in linux (Ubuntu):
importance: Undecided → Medium
tags: added: performing-bisect
William T. Lowther (624wtl) wrote :

I'd be happy to, but need some guidance. What steps do I need to perform once I go to each link?

William T. Lowther (624wtl) wrote :

Got some guidance from here:
Downloaded these 3 files:
Then did sudo dpkg -i *.deb
Rebooted, selected "Advanced...." when grub appeared, selected ckt1 generic option for boot.
"Quiet Splash" was removed earlier from the BIOS.
Bootup ended at ~2.5 sec showing "---[end Kernel panic - not syncing: No working init found. Try passing init= option to kernel. See Linux Documentation/init.txt for guidance".
I let it sit for ~50 mins but no progress.
Rebooted using the "recovery mode" and "upstart" and got the same results.
Then downloaded the appropriate files for ckt2, but got the same results.
Didn't try ckt3.
Any suggestions on the init= option thingy?
Going to bed.

William T. Lowther (624wtl) wrote :

Instead of the i386 files, I downloaded the amd64 files for the ckt1 thru 3 kernels.
When each booted to desktop, there was no connection to the internet.

Joseph Salisbury (jsalisbury) wrote :

Would it be possible for you to test the latest upstream kernel? Refer to . Please test the latest v4.5 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.


William T. Lowther (624wtl) wrote :

No change. I booted v4.5 twice and it completed the process to my normal desktop configuration, but no internet connection.
I went back to 4.2.0-27-generic and it booted up w/ the network connected.

tags: added: kernel-bug-exists-upstream
removed: bot-comment performing-bisect regression-update

William T. Lowther, could you please boot into the working Ubuntu kernel and then execute the following via a terminal:
apport-collect 1549029

tags: added: bot-comment performing-bisect regression-update
Changed in linux (Ubuntu):
status: Confirmed → Incomplete

apport information

tags: added: apport-collected wily
description: updated

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tags: added: kernel-bug-exists-upstream-4.5-rc6 needs-bisect
Changed in linux (Ubuntu):
status: Incomplete → Confirmed
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