for questions concerning Ubuntu's kernel, including compiling and questions relating to modules

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How do I use performance counters inside of the kernel?

I want to access performance counters inside the kernel. I found many ways to use performance counters in user space, but can you tell me some way to use those in kernel space. Please don't specify ...
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0answers
27 views

okay to install the latest kernel for Vivid on Trusty?

I installed 64bit generic kernel 4.0 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.0-vivid/, on Trusty (i.e. Ubuntu 14.04), following ...
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0answers
8 views

kernel mismatch after upgrading from 12.04 to 14.04?

I just upgraded my 12.04 to 14.04. After that I wanted to install the kernel headers (required to run vmware client). $ sudo apt-get install linux-headers-generic The command eventually fails: $ ...
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1answer
24 views

Installed new kernel on Ubuntu 12.04. How do I start it?

I installed linux-image-3.12.24-031224-generic on Ubuntu 12.04 but cannot find a way to start it. uname -r still says 3.2.0-80-generic. $ dpkg -l | grep linux-image ii ...
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0answers
23 views

Kernel error when trying to install Ubuntu alongside Windows 8.1

Why does this kernel error appear when I'm trying to install Ubuntu alongside Windows 8.1? And what can I do about it? Kernel Offset: 0x0 from 0xffffffff81000000 relocation range....... --[ end ...
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1answer
40 views

why does /proc/cpuinfo show a single processor on the BQ Aquaris phone?

phablet@ubuntu-phablet:~$ cat /proc/cpuinfo Processor : ARMv7 Processor rev 3 (v7l) processor : 0 BogoMIPS : 2072.57 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls ...
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1answer
29 views

Broken link for kernel (nonexistent future version)

My version (from lsb_release -a): No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.10 Release: 14.10 Codename: utopic I want to make some room ...
3
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1answer
42 views

Roll back kernel

I recently upgraded my kernel version to 3.19.3 and most of the stuff is not working (eg. Wireless, installing b43 doesn't help too, fglrx etc.) which seemed to work beautifully before , how can I ...
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0answers
16 views

Software updates after upgrading kernel

I recently upgraded the kernel to 4.0 on Ubuntu 14.04.. Will future software updates break the system? Do I need to revert back if I need software and security updates?
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0answers
43 views

Ubuntu 15.04 Vivid network-manager causes kernel panic on Lenovo G505s [on hold]

I had Ubuntu 14.10 installed on my Lenovo G505s and I upgraded to Ubuntu 15.04 in February this year (to the beta release). A few weeks ago, I updated my installation with new packages. From that ...
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2answers
822 views

What does this 'apt-get remove' instruction do?

What does the following code do? I found it on internet so I copied it and pasted it into terminal but when I installed a new kernel it only detects the old one. sudo apt-get remove --purge $(dpkg ...
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8 views

U-Boot switch kernel on OMAP device

I build my own kernel for armel architecture, successfully installed it on my device, can see it in kernels list: dpkg --list | grep linux-image ii linux-image-2.6.33-500-omap ...
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0answers
25 views

Urgent Help! ath9k how to disable 5GHz channel

I am looking for a way to disable the 5GHz in ath9k other than setting the country code. I have found that there is a patch files for the ath9k or actually the latest kernel 3.19 and 4.0 updated this ...
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1answer
32 views

What is the best config file for kernel compilation

I need to recompile the kernel and I'm not sure what config file is the best Should I use make oldconfig or make defconfig I need all the features and modules that are installed by default in a ...
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0answers
6 views

How to disable graphics card

Is it possible to disable one of my two graphics card as a grub parameter? And is it possible to disable both graphics cards?
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0answers
38 views

Apply a kernel patch [duplicate]

I wantet to ask how to apply the following two patches. https://lkml.org/lkml/2014/5/9/517 https://lkml.org/lkml/2013/5/30/513 I don't see any download for the patch files so how do I apply these two ...
1
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1answer
33 views

Do all currently supported Ubuntu releases have the same version of Linux kernel?

Do currently supported Ubuntu release (such as 12.04, 14.04, 14.10, 15.04) have the same versions of Linux Kernel? Or older Ubuntu releases may not have as recent Linux kernel as newer Ubuntu ...
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2answers
64 views

Is it ok to update kernel to 3.19.3

I've got a lab assignment to compile linux kernel , so I wanted to ask if its safe to install latest kernel (3.19.3) on my current Ubuntu 14.04 , I've got important data on my laptop so I cant afford ...
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0answers
37 views

How can I tell if my Ubuntu kernel leap second bug free?

I have few Ubuntu boxes Linux SERV01 2.6.32-38-server #83-Ubuntu SMP Wed Jan 4 11:26:59 UTC 2012 x86_64 GNU/Linux How can I check if the installed kernel is leap second bug free ? Don't have ...
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0answers
18 views

Need Ubuntu with real-time extensions and GLIBC >= v2.15

I have Debian Wheezy with an RTAI kernel but it has EGLIBC 2.13 and I need 2.15 or higher. I've tried compiling a kernel with PREEMPT-RT on Ubuntu 14.04 and latency is horrendous, so something didn't ...
0
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1answer
82 views

Ubuntu 14.04 freezes

I have Ubuntu 14.04. After having updated the system to kernel 3.13.0-49-generic, I re-booted and now everything freezes! I can not log in. (Keyboard and mouse do not work as well) I found this line ...
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1answer
45 views

Wifi Broadcam: ERROR (dkms apport) kernel not supported

m trying to install wifi driver for : Broadcom Corporation BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03) in my Macbook pro, but after following this answer (Setup problems ubuntu ...
0
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1answer
132 views

ath10k installation

I have exhausted google on how to do this, compounded by being a beginner. I am trying to install this module. I have a nice new Acer Nitro (which will be even nicer once I remove dependency on win ...
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4answers
3k views

Why is it unsafe to delete old kernels?

I have run out of space on my boot drive, so I decided to remove old kernels. I found this page which describes exactly what I should do: Lubuntu Documentation: Remove Old Kernels. I have deleted the ...
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1answer
65 views

How to upgrade the kernel correctly?

Running uname -r in a terminal gives an output saying 3.13.0-37-generic, but I am trying to upgrade the kernel to 3.16, and indeed I have ran sudo aptitude safe-upgrade which installed ...
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2answers
112 views

After every kernel update I reinstall the Nvidia drivers and lose the Unity bar

After each kernel update, after the reboot I don’t get anything on screen, therefore I switch to the console (Ctrl+Alt+F1) and reinstall the Nvidia drivers, then I reboot but I don’t get any Unity ...
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0answers
55 views

Deleting old kernel modules manually

Basically I like to have a "clean" system; so I run the ubuntu-tweak janitor from time to time to delete the old kernels. Today I did some manual checking and found the subdirectory 3.13.0-49-generic ...
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0answers
48 views

BGRT Errors on boot - Custom compiled kernel 3.19.3

After compiling my own kernel (yes, I know I'm not entitled to any support), I receive this message on boot: [ 0.077204] Ignoring BGRT: invalid status 0 (expected 1) It disappears after a few ...
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0answers
38 views

Dell e7440, sleep sometimes fails, kernel logs show ACPI errors

I have a new Dell Latitude E7440 with Ubuntu 14.04.2. Sometimes (but not always), after sleeping, I cannot resume, as after trying to resume one of the following happens: I can move the mouse but ...
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0answers
19 views

Not able to configure bluetooth wireless earphones w/3.11.0-12-generic kernel

Greeting Linux Debug Demigods, Just confiscated a really slick pair of Bluetooth wireless earplugs. I finally realized my machine does not include Bluetooth hardware, and so tracked down, and plugged ...
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0answers
24 views

Removing Utopic HWE-Stack and downgrading X.org and Kernel to use external projector on ThinkPad T450 running Ubuntu 14.04.2

As indicated in the previously asked question: 14.04 Thinkpad T450: Text getting messed up on large screens I am also experiencing this problem (garbled text and missing letters) when using an ...
1
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1answer
256 views

Kernel updates will not install - boot partition full

I am running 14.04 LTS. Kernel updates will not install or uninstall. The boot space (approx 240Mb) is now full and using sudo apt-get autoremove, autoclean, clean or remove will not work. This all ...
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0answers
23 views

Kernel reports wlan0 “connection lost” frequently [duplicate]

I'm getting this message frequently: wlan0: Connection to AP f8:d1:11:44:01:06 lost This happens only on my work, not my house. I workaround this with sudo service network-manager restart or ...
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0answers
14 views

Ubuntu Touch AppArmor Kernel Patches

new to Ubuntu development: I am porting Ubuntu touch to my own device. There are many different commits related to AppArmor on ...
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0answers
18 views

Ubuntu Touch Kernel Config [easy question]

I'm in the process of porting Ubuntu touch. Based on the porting guide, https://developer.ubuntu.com/en/start/ubuntu-for-devices/porting-new-device/#anchor4 I would like to know which kernel is it ...
0
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1answer
29 views

How to reinstall the kernel with a crippled OS?

I use Ubuntu 14.10 and as it happens quite often my /boot partition got full. Usually in this case I use apt-get to manually remove one or a few old kernels and everything is fine again for a few ...
2
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1answer
252 views

VMWare Player 7.1.0 on Ubuntu 15.04 (kernel: 3.19.0-10-generic) app loading

I downloaded the latest version of the VMWare player (v 7.1.0) from here. Installed the bundle, and the installation went through fine. Post-installation, when I tried to launch VMWare Player, but ...
0
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1answer
31 views

grub and libfuse error

After I updated packages: gnupg gpgv libgcrypt11 libtiff5 (on Ubuntu 14.04.2 LTS Linux version 3.13.0-48-generic) and then did an apt-get autoremove which removed: linux-headers-3.13.0-46 ...
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0answers
46 views

Unable to upgrade kernel on Ubuntu 14.10

I'm trying to upgrade my kernel from the current one (3.13.0-36-generic) to 3.18.5, but my system doesn't get updated after rebooting. I have tried with other kernel versions, but none seems to work ...
2
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1answer
80 views

dkms Installed kernel module but not working after reboot

I bought a keyboard that is shown on lsusb: Bus 002 Device 009: ID 0c45:7603 Microdia but the Ctrl, Windows/Super and Alt buttons are all mapped to Shift button. So I followed the hardware code and ...
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0answers
33 views

Ubuntu Server 14.04.2 LTS restarts continuously

is my first time asking here, so, congrats for the forum, is very instructive! I have an Ubuntu Server 14.04.2 LTS (64bits), and when Im working with that, I don't know exactly why, it restart again ...
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2answers
146 views

Nvidia Driver Install Error - “Kernel module failed to build.”

I'm trying to install this because Nouveau / the default driver, is unstable for me, and eventually results in GPU lockups unless I'm running low graphic mode. Got this error while trying to install ...
1
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1answer
94 views

How to install Ubuntu Trusty 14.04 in a qemu virtual machine

I'm running Debian Jessie amd64 with qemu version 1:2.1+dfsg-11 and want to install Ubuntu 14.04 for amd64 in a qemu virtual machine. But the installation process doesn't start because of a kernel ...
0
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0answers
15 views

Verbose messages at system start

In 14.04 after adding VERBOSE_INIT=YES to linux line in Grub it was possible to enable verbose messages at system boot. In 14.10 this trick doesn't work any more. Removing quiet argument from linux ...
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0answers
9 views

Strange error while loading a compiled module.

I want to have read/write support for UFS filesystem on my ubuntu 14.04. To do that, I downloaded the latest sources for ubuntu kernel using the command :- apt-get source linux-image-$(uname -r) ...
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1answer
15 views

custom kernel for secure system

I am pretty new to the linux community and I've started learning it for last few months. After learning the basics of commands and system architecture im now trying to learn the grass root level ...
0
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1answer
22 views

how to check if zfs is using the kernel module

I am having perfomance troubles (transfer rates only about 50MB/s using 6 2TB server hdds WDC WD2003FYYS, each doing app 150 MB/s) with my raidz and was hoping to increase it with the ZFS on Linux ...
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6answers
7k views

How is 'rm -rf /' able to delete all files in the system?

I haven't tried this command on Ubuntu (for obvious reasons) so I am not sure if Ubuntu will allow its execution. But it's famous for deleting everything. Just out of curiosity, what happens when the ...
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0answers
16 views

Building and Flashing new kernel

How can i build and install a new Linux Kernel to the Ubuntu. I wanted to build the kernel and reload Ubuntu with new kernel -Thomas
-1
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1answer
21 views

Loaded Modules Information using a trusted lsmod command

I have copied lsmod command script from /sbin/lsmod to a directory. I renamed lsmod to elsmod. Now when i run this command from a script it doesn't give me any output. what should i do to get the ...