Questions tagged [kernel]

Linux is the name of the kernel used in Ubuntu as well as other GNU/Linux operating systems. Use this tag for questions related to upgrading and installing kernels, compiling, patches, and kernel modules.

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Switching back from development to default kernel

I'm on Ubuntu 14.04. My kernel version is kernel: 3.16.0-031600rc4-generic. I must at some point, for some reason, have switched to a development kernel but I can't remember how. How do I switch back ...
user2140693's user avatar
10 votes
2 answers
32k views

Values of WCHAN in ps

What does the WCHAN (waiting channel) mean exactly? what can be its value and what those values represents? I tried to find them but got nothing.
Chirag Acharya's user avatar
0 votes
1 answer
422 views

How do I get rid of old linux-headers-3.xx.x-xx files? [duplicate]

I frequently run into the problem that I don't have enough space on /boot left. When that happens, I use this answer to free space. The output of the command shown there gives me not only a bunch of ...
simbabque's user avatar
  • 727
0 votes
1 answer
226 views

keep getting kernel 3.19.0-28-generic must be compiled

I have this problem and I even did: sudo apt-get install linux-generic sudo apt-get install linux-headers-generic sudo apt-get install -y build-essential linux-headers-generic But it didn't help, ...
aladin aladin's user avatar
0 votes
1 answer
2k views

How to make a version of Linux kernel default in grub?

I am using Ubuntu 14.04 with Linux kernel 3.19.0.25. Earlier I had some issues with 3.19.0.28, my screen was freezing on boot, with 25 I am not facing those issues. So I want to make 25 my default ...
Aditya's user avatar
  • 117
5 votes
2 answers
8k views

"No network devices available" when wireless previously worked. (14.04)

I'm running Ubuntu 14.04 on my laptop. The last time I used it (several weeks ago) the wireless was working fine. I turned it on today and no networks will show up, with the network menu saying "No ...
Eli Silverhand's user avatar
0 votes
1 answer
2k views

Frequency scaling no longer works after kernel upgrade

Using kernel 3.13.0-37, CPU frequency scaling works and I can control it using the CPU frequency control applet. I have upgraded to kernel 3.16.0-38, the applet now informs me that CPU frequency ...
hatterman's user avatar
  • 2,280
27 votes
2 answers
51k views

How can I avoid kernel updates?

I want to freeze the kernel-version of Kubuntu 14.04.1 LTS Trusty. Is it enough to comment line 5 and 6 of the /etc/apt/source.list (see below)? 4 ... 5 deb http://de.archive.ubuntu.com/ubuntu/ ...
musbach's user avatar
  • 1,445
1 vote
1 answer
235 views

Secure Auth/Encryption Smart Keyboard

Due to the nature of a personal subnet (hardened on the outside, trusting/naive on the inside) I'm starting a project within my network (routed by a Ubuntu 15.04 Desktop with OpenVPN public/local ...
alisenby94's user avatar
1 vote
0 answers
105 views

No sound anymore on Lubuntu 14.04.3, Kernel 3.13.0-63

The current version of Lubuntu (kernel 3.13.0-63 in use now) produces no sound anymore. Neither Audacious, Gnome player, YouTube or CD player produce sound. My installation CD (Lubuntu distribution 14....
AlbertJohn's user avatar
5 votes
2 answers
1k views

Kernel panic 1/10 times after resume from suspend

I have a HP Notebook 15 running Lubuntu 15.04. On occasion after closing the lid and having my laptop suspend, I get kernel panic when I resume. Caps lock is blinking, and the screen locks - I have ...
Martin's user avatar
  • 71
0 votes
1 answer
266 views

Boot volume full?, problem removing old kernels

I know there are a lot of questions on this but I have been through a lot of them and can't seem to get past a problem. Steps so far - Removing old kernels via apt -> Fails due to lack of space So ...
user1312469's user avatar
0 votes
1 answer
1k views

Kernel driver not installed (rc=-1908) -- Again

After I read the solution in VBox on 14.04: Kernel driver not installed (rc=-1908) I got following error after install ... No suitable module for running kernel found invoke-rc.d: initscript ...
Thh Kii's user avatar
0 votes
1 answer
1k views

Can't make, says Kernel source is missing

I'm trying to follow the instructions here http://wiki.freepbx.org/display/FOP/Installing+FreePBX+13+on+Ubuntu+Server+14.04.2+LTS to install FreePBX/Asterisk on my Ubuntu server. When I try to ...
Transmatrix's user avatar
0 votes
3 answers
18k views

br_netfilter missing in ubuntu 14.04

I have the following problem when running docker.io: Running modprobe bridge nf_nat br_netfilter failed with message: modprobe: WARNING: Module br_netfilter not found. I tried running modprobe ...
Veda's user avatar
  • 305
3 votes
2 answers
4k views

How do I find out which driver version of BtrFS I am using?

I was reading through a couple of BtrFS articles online. Sometimes I saw statements like Do not use BtrFS versions older than 0.20rc1. How can I find out which version is in my Kernel?
koloman's user avatar
  • 347
1 vote
1 answer
313 views

How to get debuginfo package for -rt kernel

I have Ubuntu 14.04 with 3.14.3-rt4 kernel. I have to use SystemTaptool and I must have debug symbols to use it. I follow the instruction in here but there are no debug symbols for my kernel and when ...
RaSha's user avatar
  • 133
1 vote
1 answer
472 views

Unmet dependencies, lost archives, and missing source packages while upgrading kernel to 4.2.0

While trying to update my kernel I found I was missing archives. This is the error message on my computer (and when I try to open synaptic to uninstall the packages) The package linux-headers-4.2.0-...
Eli Rangel's user avatar
1 vote
1 answer
952 views

What caused this crash shown in syslog?

What happened here? System was unresponsive when I attempted to log in next morning. Sep 21 12:38:02 pratchett org.freedesktop.Telepathy.AccountManager[2233]: (process:2488): GLib-GIO-WARNING **: ...
Fred Zimmerman's user avatar
1 vote
0 answers
235 views

kernel boot takes too long, probably asus makro key usb keyboard related

I would like to solve my long boot issue. 3.19.0-28-generic #30-Ubuntu SMP Mon Aug 31 15:52:51 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux I think it might be related to ASUS ASUS ROG Macrokey keyboard ...
Daniel Muller's user avatar
1 vote
2 answers
2k views

EXT4-fs error on Ubuntu 15.04 crashing after installing an HDD for extra space, Kernel panic on live USB boot [closed]

Earlier last week I went ahead and bought a 1TB HDD so I could store some extra files on my work machine. Now I'm having problems with the system crashing. The first time I got the following error ...
Csteele5's user avatar
  • 171
1 vote
1 answer
80 views

How can an internal hard drive be made completely inaccessible for the system?

I've "rescued" my whole main system HDD onto another fresh drive (using a live CD, to be able to easier access / and /usr from X11), and now I'd like to pretend as if I had physically removed the old ...
syntaxerror's user avatar
3 votes
2 answers
6k views

AUFS driver not loaded / found on kernel 4.* branch

I've tried upgrading my kernel from 3.19.0-22 to any of the kernel 4.* releases in Ubuntu 15.04 but upon rebooting I've found that docker doesn't work anymore. Sep 19 12:37:14 sniper docker[1098]: ...
dlsniper's user avatar
  • 135
1 vote
1 answer
202 views

How do I recompile my kernel without qt3?

So I'm trying to recompile my kernel (it doesn't have uinput support but nm that). I followed the instructions on How to install needed Qt packages to build kernel on 14.04? but when I run ~/...
Jason's user avatar
  • 583
7 votes
2 answers
12k views

Can't start LightDM after recent kernel update

Whenever I boot, it show Plymouth then goes to a screen full of boot log, I -think- the only relevant part is Starting Wait for Plymouth Boot Screen to Quit...es.ileged Tasks.s..p link was shut down......
Aido's user avatar
  • 522
0 votes
2 answers
559 views

Disable IPv6 on 14.04 with IPv6 disabled kernel

How do i disable system wide IPv6 within ubuntu? I know so many answers in here about this but situation is different. This is an embedded device. Here is my conditions: IPv6 disabled in kernel to ...
obayhan's user avatar
  • 275
9 votes
1 answer
3k views

Is it OK to delete the /boot/initrd.img file on a running system

I have a server with a RAID1 root partition, but it has a small partition for /boot on each of the two drives: I 'dd' one to the other whenever an update is made. Unfortunately the /boot partition is ...
Peter Ford's user avatar
1 vote
0 answers
678 views

end Kernel Panic (14.04)

I'm new to Ubuntu, so you'll have to forgive my naivety. I was watching TV online and my laptop froze (Screen darkened, nothing responding), I left it for around 5 minutes hoping it'd sort itself out....
Michael James Allcock's user avatar
2 votes
1 answer
617 views

Installing Linux 4.3 on existing Ubuntu release

Suppose we have a stable Ubuntu release installed, such as 15.04 or 14.10 (my case). Suppose we have no interest in upgrading userland software, but have a dire need for a state-of-the-art kernel (in ...
Incnis Mrsi's user avatar
3 votes
1 answer
8k views

How to check if the kernel version running is the one supported by Ubuntu?

When I boot my machine I get a list of installed available kernels to choose from, how do I know which kernel is the one that is supported by my particular Ubuntu distro version? See the following two ...
Markus's user avatar
  • 113
4 votes
0 answers
2k views

How do I start my Laptop with root partition on lvm2 thin pool

My Laptop is configured as dual boot system with Ubuntu 14.04 (and windows 8.1). Lately I replaced the dedicated root and swap partitions with a lvm2 partition (VG (Volume Group) LinuxBereich) ...
Wolfgang Koch's user avatar
4 votes
2 answers
418 views

How to report kernel issues

This is a followup to this other thread: USB ports not working all of a sudden I'm working on an Acer Aspire E 15, with the OS being Ubuntu Studio 14.04. I noticed that the last kernel version: ...
il mietitore's user avatar
1 vote
0 answers
733 views

Kernel Panic - not syncing: VFS Unable to mount Root is on unknown-block(0,0)

I received a Kernel Panic error after updating Ubuntu server. After passing the GRUB menu, I received the following error. I have been hosting a mediawiki on that server that is not backed up. I do ...
OriginalFlavor's user avatar
41 votes
4 answers
73k views

bioset process - what is its function?

What is the function of the bioset process? Why is there no documentation for the bioset process? Why are there no definitive answers to the questions about the bioset process already posted? What ...
James Jadesword's user avatar
1 vote
2 answers
1k views

How do I identify the correct driver to blacklist in modprobe?

Without disabling anything in my bios, I want to disable and keep the OS from loading any drivers or registering the smartcard contact interface that is part of my laptop. I understand that this can ...
Gary Z's user avatar
  • 161
2 votes
1 answer
1k views

Displaylink installation Kernel version 3.13.0-55-generic is too old

I am following this guide: How to install displaylink on ubuntu To install displaylink on my ubuntu 14.04. Everything works fine however when i go for the last step and attempt to install the .run ...
Marc Rasmussen's user avatar
1 vote
1 answer
312 views

Ksplice - What happen if server power-down when updating kernel

I am finding a rebootless solution for updating kernel. I saw Ksplice. I have a question: What happen if our servers power-off when updating use Ksplice? Our servers will be OK? What will revert our ...
duka's user avatar
  • 11
1 vote
1 answer
1k views

Need help installing VirtualBox on ubuntu 12.04

I am running on chroot and the log file reads : Uninstalling modules from DKMS Attempting to install using DKMS Creating symlink /var/lib/dkms/vboxhost/5.0.2/source -> /...
Mike's user avatar
  • 11
3 votes
1 answer
3k views

apt-get having dependency problems

I noticed the issue when I tried to upgrade Python, but it seems to be a problem for all apt-get commands. When I do uname -a I get Linux sarah-ThinkPad-X220 3.13.0-61-generic #100-Ubuntu SMP Wed ...
s.py's user avatar
  • 65
2 votes
2 answers
2k views

Unable to install vmware workstation on ubuntu 15.04

When i install VMware workstation on my Ubuntu 15.04 with kernel updated from 3.19 to 4.2 . It shows below path /tmp/vmware-root/vmware-modconfig-8097.log Hence, i go to check the path and find ...
magdum's user avatar
  • 21
1 vote
0 answers
33 views

kernel building errors investigation

Tried to built kernel using this simple guide: https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel I've got only one "...all.deb" file instead of 3 files. How can I track errors? Are there any logs of ...
ngc3o34's user avatar
  • 65
3 votes
0 answers
666 views

How do I sign my own kernel modules to avoid tainting the kernel?

I've made a kernel module, using this tutorial as an example. It works, but on loading I get a warning in kernel log: gdt_get: module verification failed: signature and/or required key missing - ...
Ruslan's user avatar
  • 1,733
1 vote
1 answer
775 views

Need help! kernel compilation error!

https://www.youtube.com/watch?v=ekHpIfiUt8M i followed this guide, unfortunately TWICE got this error : make[2]: Entering directory /home/dante/kernel/linux-4.2' scripts/kconfig/conf --...
Neero's user avatar
  • 11
0 votes
1 answer
73 views

patching kernel (every update?)

I'm about to apply that famous patch that makes vgaarb see nvidia as a VGA device to the kernel. But Linux releases a new kernel only every 2 month as I know. And Ubuntu kernel releases are even ...
ngc3o34's user avatar
  • 65
4 votes
3 answers
8k views

igb Detected Tx Unit Hang

Have a: lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty with kenel 3.16.0-46-generic. Today i do dist-upgrade and ...
user avatar
1 vote
1 answer
496 views

vgaswitcheroo has no effect

I have a Dual Graphics setup on my Laptop. [root@MISTRI ashesh] $ lspci -vnn | grep '\''[030[02]\]' 00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics ...
Ashesh's user avatar
  • 185
6 votes
4 answers
2k views

Cannot delete old kernels

I ran the command: dpkg -l | grep linux-image- and got this list rc linux-image-3.13.0-51-generic 3.13.0-51.84 rc linux-image-3.13.0-52-generic 3.13.0-52.86 rc linux-image-3.13.0-53-generic 3.13.0-...
jansmits's user avatar
  • 101
0 votes
1 answer
200 views

Help applying touchpad fix to rc.local

I'm new to Ubuntu and trying to implement a permanent solution to my touchpad not working in Ubuntu 15.04. The solution I have so far only works until I restart/reboot so I've tried to add it to rc....
Rich Stanton's user avatar
2 votes
0 answers
310 views

Bumblebeed and bbswitch error

I have a problem with my MSI-GS60 laptop under Ubunutu. I explain: First of all, with this laptop I had a wifi unrecognized issue. So I had found somes posts talk on that and I had finaly found a ...
avallete's user avatar
  • 169
4 votes
1 answer
1k views

Keep old kernels

I am doing experiments with few Linux kernels, also I want to keep all the kernels on my system; I don't want then to be removed automatically. how do I achieve that? (NOTE: I have mounted /boot on ...
Alex Jones's user avatar
  • 7,980

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