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

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5
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1k views

Is there a guide for using GRSecurity and Precisew/ PAX?

I'd like to know if there is a guide of some kind for (successfully) configuring, compiling and installing GRSecurity w/PAX etc. in Precise? I basically am trying to build my own custom release ...
4
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0answers
204 views

Why are the official/stable 4.* kernels marked unstable?

Kernel.org shows 4.1.1 and 4.1.2 as stable. Why then, are they named *-unstable/* here: http://kernel.ubuntu.com/~kernel-ppa/mainline/
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0answers
6k views

Failed to load ZFS module stack

Have been using zfs on linux (zfs-native/stable) raidz on 14.04 for several months without hitch and decided to move across some more important files as considered it trustworthy or I guess "stable" ...
4
votes
0answers
1k views

Wireless Dropping Out Using Intel 7260AC Card (Deauthenticated - Reason 7)

I have recently bought a new laptop and it has an Intel 7260AC wireless card in it. I am getting regular wireless dropouts occurring at no specific interval. AFAIK this only occurs at my house. ...
3
votes
0answers
27 views

enable parallel port interrupts/ access in Ubuntu 12.04

I need to interface a mid 1990s laboratory instrument to Ubuntu 12.04 for moderately high speed data acquisition ( 100 Usec) from the instrument . The instrument requires ( will not even run without ...
3
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0answers
63 views

Ubuntu wifi usually not working on boot, needs kernel module restart

After installing Ubuntu on my netbook, an F205TA, wifi seems to be not working correctly. Usually wifi is not working after boot, but starts working after one or more tries of: sudo modprobe -r ...
3
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0answers
205 views

Ubuntu upgraded to 15.10, now laptop won't reboot

Samsung 400B laptop Yesterday I left my laptop upgrading to 15.10 (I think it was Wily something) about half way through. When I returned the laptop was hung with nothing on the screen. Hard ...
3
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0answers
55 views

Compile or Cross-compile open source driver for Aquaris E4.5 Ubuntu Phone

I am trying to connect an OTG USB-Ethernet adapter on the Aquaris E4.5 running kernel 3.4.67. The adapter is Cable Matters AX88179 which has open source drivers available for linux. The installation ...
3
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0answers
2k views

module verification failed: signature and/or > required key missing - tainting kernel

i am newbie in linux device drivers,after installing the driver in ubuntu 14.04 it showing the message module verification failed:signature and/or required key missing-tainting kernel for my module ...
3
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47 views

Why does 3rd digit in Ubuntu kernel version not match 3rd digit in its mainline upstream kernel version number?

From the Ubuntu Kernel FAQ ( https://wiki.ubuntu.com/Kernel/FAQ ) : Given an Ubuntu kernel package version how do we find the release it is from? The kernel package version is of the following ...
3
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0answers
267 views

Virtualization limits for Ubuntu Server 14.04 LTS with KVM

Essentially I'm after something like this, but for Ubuntu Server 14.04 LTS. I'm trying to create some KVM guests with very large 1TB+ RAM (through OpenStack Nova). I can boot the 1TB VM fine, but I ...
3
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0answers
581 views

Screen brightness issue Toshiba Portégé after 15.04 upgrade

I have a Toshiba Portégé Z30-A-13P. I can no longer adjust my screen brightness after upgrading Ubuntu to version 15.04 (Kernel 3.19). The screen brightness (as well as the touch-pad) didn't work ...
3
votes
0answers
554 views

Encrypted disk kernel warning - initramfs image won't boot

After an upgrade to 14.10 on my netbook, I can only manage to boot with the old kernel remaining from the previous 14.04 installation. For the most recent kernels, I get this warning when they are ...
3
votes
0answers
660 views

14.04 - USB microphone speaker device not working anymore

I own a PJP-20UR web conference microphone speaker, I have been using this USB device for ages with Linux, Windows, Mac never ever have had any issues with it. Since I upgraded from Ubuntu ...
3
votes
0answers
537 views

Can't switch to Discrete GPU Hybrid Graphics ATI/intel

Just recently I had got my hybrid graphics working with DRI_PRIME=1. I obviously have the open source drivers. Now for some reason that I can't figure out it has stopped working. xrandr ...
3
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0answers
1k views

make [1] leaving directory error

When I run make command for patching CRCN on ns2 under Ubuntu 12.04, I am faced with this error: make[1]: Entering directory `/home/apadana/ns-allinone-2.31/ns-2.31/indep-utils/cmu-scen-gen/setdest' ...
3
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0answers
336 views

Why aren't my changes to /etc/security/limits.conf having effect?

I am trying to provide support for core dumps on my Ubuntu machine (as by default they are disabled). So I have made the following changes to /etc/security/limits.conf: root hard core 1000 After ...
2
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0answers
20 views

USB Keyboard Barcode Reader Dropping Chars

I bought a barcode reader which connects over USB and mimics a keyboard. Connecting to Windows, the barcode is read correctly but connecting to Ubuntu, it drops some repeating chars. It consistently ...
2
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0answers
38 views

Are modern Ubuntu installs compatible with ancient Kernel versions?

On Ask Ubuntu we occasionally see people with problems like: I'm running 10.04 Lucid LTS on my toaster. I'd like to upgrade but I have expensive proprietary hardware that only has drivers for ...
2
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0answers
82 views

X.Org does not work with a lowlatency kernel

I am using Ubuntu 14.04 with the 3.13.0-74-generic linux kernel, but I would like to use a lowlatency kernel. I have installed it using: sudo apt-get install linux-image-lowlatency And I have tried ...
2
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0answers
100 views

Unable to fix kernel panic

I am expiriencing a kernel panic that doesn't let me boot regularly. I've been trying to solve it for two weeks now, but am still unable to. Hopefully you can give some clues. "Normal" boot exits ...
2
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0answers
79 views

clearing old kernels has left black screen after login ubuntu 14.04 lts - help

If I have removed files unwittingly in a clear up of old kernels can I reinstall Grub or do something to recover my desktop ubuntu 14.04 gnome? Following instructions on how to clear out older ...
2
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0answers
605 views

Kernel not upgraded to 4.2.x

I upgraded from Ubuntu 15.04 64-bit to Ubuntu 15.10 64-bit but noticed that my kernel didn't upgrade and still shows: . $ uname -r 3.13.0-35-generic So I tried the following command to upgrade it ...
2
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0answers
627 views

Why ubuntu 15.10 still needs restart to update the kernel?

I upgraded my system to ubuntu 15.10 dev a while ago and the kernel was 4.2.0-14. A new update downloaded kernel 4.2.0-16 but "uname -a" still shows the current running kernel as 4.2.0-14. Linux ...
2
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0answers
578 views

Couldn't open module fglrx

I was using fglrx driver long ago, but I switched to open-source driver. In the Xorg.0.log I'm getting following warnings. [ 35.380] (II) LoadModule: "glx" [ 35.416] (II) Loading ...
2
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0answers
149 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 - ...
2
votes
0answers
30 views

Redistribution of Ubuntu 14.04 LXDE

I wish to inquire about the intellectual property policy, where it is stated: You can redistribute Ubuntu, but only where there has been no modification to it As a commercial company with ...
2
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0answers
55 views

Debugging kernel running on AMD target from Intel host - how to return control to gdb?

I have compiled kernel 3.13.0-55 on Ubuntu on both AMD and Intel machines. I tried to copy compiled kernel to Intel target but it won't boot with that one. Therefore I have compiled the same version ...
2
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0answers
179 views

CPU hard lockup with Ubuntu 14.04 server on AMD machine

I have the following workstation configuration with 64 cores: 4x AMD Athlon 6378 2.4GhZ 128 GB Ram Supermicro motherboard H8QGI-F-O 2 x 512 GB SDD Samsung with software RAID-0 setup I am running ...
2
votes
0answers
1k views

Why aren't all of my CPU cores always detected in ubuntu 14.04 with an Intel Core Duo 2 CPU?

I'm using Ubuntu 14.04.2 LTS with kernel 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux. Computer model: iMac Late 2009 ( ...
2
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0answers
302 views

WiMAX in Ubuntu

About two weeks ago I asked a question about how to connect to WiMAX. And today I have done some research, and I want to share it with everyone. I don't know if this is going to be useful for someone, ...
2
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0answers
267 views

Slow boot on Ubuntu 15.04 during ACPI

The time seems to be wasted mainly between these two log lines. What could it be waiting for ? Apr 30 01:19:22 terodde kernel: [ 0.907820] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query honored via ...
2
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0answers
279 views

Ubuntu 15.04 hang when boot virtualbox Centos 6

I have a freshly ubuntu 15.04 64 bit. A virtual box 4.3.26 r98988. And this image http://repo.scalefactory.com/vagrant/centos-6-x86_64-20.box Now everytime I try to boot the VM, my laptop hang. Here ...
2
votes
0answers
406 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 ...
2
votes
0answers
362 views

Undefined reference error while using custom system call in kernel 3.19

I'm trying to import new system call in the kernel 3.19. I've followed the tutorial given here! This is my simple code to implement factorial calculation via system call. #include ...
2
votes
0answers
342 views

Ubuntu snappy not booting

I'm trying to boot Ubuntu snappy on a BBB and after I've corrected the uEnv.txt as posted on ubuntu core webdm alpha for Beaglebone Black not booting it freezes at Starting kernel .... The full upboot ...
2
votes
0answers
1k views

udev and eMMC rpbm partitions

I'm running into this bug: Fix udev rules to consider mmc rpmb partitions and trying to solve it using a udev rule. I haven't needed to learn anything about udev in the past, so have been reading up ...
2
votes
0answers
634 views

Error calling EVIOCSKEYCODE

Using 14.04, I have the following error displayed when booting up: Error calling EVIOCSKEYCODE It doesn't cause any problems with the system, but I would still like to remove it. Now, I managed ...
2
votes
0answers
591 views

How do I load a module that has no signature in ubuntu 12.04?

I've got a custom module for a Mightex camera that has been tested for ubuntu 12.04 which I'm using. I have installed it however something is not working. I think it has to do with this dmesg output: ...
2
votes
0answers
115 views

kernel panic on boot

I'm having some trouble booting ubuntu 14.04. The most weird thing is that after the kernel panic error shows up, if I restart the laptop, grub appears (not showing up when the panic occurred), and ...
2
votes
0answers
3k views

signature and/or required key >missing - tainting kernel CrystalHD

I am running Ubuntu 14.04 32bit under Gnome on my plastic 2007 Macbook. The old laptop is still going strong, but I wanted to lesson the load on my cpu on video files. To do this I installed a ...
2
votes
0answers
43 views

Wine stopped working

Wine worked yesterday, however I downloaded some updates to the kernel and since then when I try to run Wine, I get error messages. I assume this is related to the kernel update. Anyway to overcome ...
2
votes
0answers
177 views

Which software ppa to use after applying LTS Enablement Stacks

I have applied the LTS Enablement Stacks on Ubuntu 12.04 LTS I am now running 12.04.5 with kernel 3.13.0.36 (so I guess these are the same Kernel than those currently on 14.04 LTS?). In my list of ...
2
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0answers
103 views

How do I resolve a kernel panic without reinstalling?

I forgot to make a backup and it would take forever to reinstall and get it to a point I could use even if I were to copy over the home folder. I recently got a kernel panic with the message ...
2
votes
0answers
150 views

Unable to boot after update

After a update, Ubuntu won't boot anymore and gives: error: could not read file. If I'm fast enough to press a button to continue, I get Kernel panic - not syncing: VFS: Unable to mount root fs on ...
2
votes
0answers
2k views

Hangs On or After fsck from util-linux 2.20.1

I have a box running at DigitalOcean with Ubuntu 12.04 It's rare that my system will boot or takes forever - normally it just hangs / chokes. A reboot from a remote shell used to be pretty quick and ...
2
votes
0answers
878 views

Modprobe: 'Invalid nodule format', yet works after insmod

I am having a problem with Ubuntu 12.04 not properly recognising a custom made kernel module. The kernel module is a spoof of raw1394. So that programs that look for the presence of a raw1394 module ...
2
votes
0answers
285 views

12.04: Kernel panic - not syncing: Attemped to kill the idle task!

My parents got this error on their machine, so I'm not sure what triggered it. My dad says it just happens randomly. It apparently happens every couple of days, but this is the first time I've been ...
2
votes
0answers
768 views

How to make Huawei 4G module ME909u-521 work on Ubuntu?

I'm having some trouble having an Internet connection on 4G with Ubuntu (latest version, latest kernel). I had no trouble making my Huawei E3276 LTE dongle work. Now I'm trying to connect my ...
2
votes
0answers
93 views

How to safely update software with a non-standard kernel?

Background I have an Asus UX302LA laptop running Ubuntu 14.04. As the default kernel mainline (3.13.*) is incompatible with the GeForce graphics card it ships with I switched to to a ...