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

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How to change the Delayed Acknowledgement timer? (14.04)

I am trying to set different values for the timer of the Delayed Acknowledgement and see the different behaviors at packet level. I expected this to be a kernel level option but I can't locate ...
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0answers
11 views

Wireless automatic disconnection

My wireless connection automatically drops once in a while. Once that happens, I use WICD to reconnect to the wireless network, which shows that it puts down and up wireless interface. I wonder if ...
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1answer
21 views

Does firmware depend on OS and architecture?

I learned that firmware of a device runs in the device. So does firmware of a device not depends on the computer architecture and the OS kernel? (I know that a driver of a device depends on arch and ...
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0answers
24 views

Will I get update on both kernel and application, on my Ubuntu 14.04 with kernel 4.0?

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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17 views

VMware and kernel 4.0 [on hold]

I'm trying to install VMware in Elementary OS freya updated with kernel 4.0 but it doesn't start. The error suggests incompatibility with kernel 4.0. How can I solve this?
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1answer
22 views

Install linux package in iso into ubuntu [duplicate]

here I want to ask, I am familiar with ubuntu, with unity, shortcuts, etc. I have learned about Kali linux, I have installed Kali linux in my PC but I am not familiar with the environment, I've had ...
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1answer
20 views

How long after release will the last LTS get a HWE kernel?

The Vivid release is just around the corner so as a 14.04 user I'm curious to know when there'll be a supported kernel upgrade available. I have several machines running on Utopic's kernel and I'll ...
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0answers
9 views

How do I use performance counters inside of the kernel? [on hold]

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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44 views

okay to install the latest kernel for Vivid on Trusty? [on hold]

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
10 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
25 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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24 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
41 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
34 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
43 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
45 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
927 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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0answers
10 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
26 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 ...
1
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1answer
36 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
39 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 ...
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1answer
34 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
65 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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38 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 ...
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1answer
87 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
136 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
67 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
114 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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56 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
49 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
40 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 ...
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1answer
263 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
15 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
19 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 ...
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1answer
30 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
264 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 ...
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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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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
81 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 ...
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1answer
97 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 ...