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

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62
votes
7answers
203k views

How can I install on a non-PAE CPU? (error “Kernel requires features not present on the CPU: PAE”)

After burning Ubuntu 12.04 to a CD, I tried booting and got the message: This kernel requires the following features not present on the CPU: pae Unable to boot - please use a kernel appropriate for ...
26
votes
3answers
36k views

How do I add a kernel boot parameter?

I need to add the boot parameter foo=bar to my kernel. How can I do this once for testing, and permanently if testing was a success?
59
votes
10answers
78k views

Desktop does not show when I installed nvidia drivers!

The desktop does not show after I installed nvidia experimental drivers. I tried nvidia simple proprietary drivers, and they did not work either. Here is how it looks. This is not cropped or any ...
27
votes
8answers
116k views

How to update kernel to the latest mainline version without any Distro-upgrade?

Currently I'm running Linux-3.0 and I want to update it to Linux-3.3.1 the latest stable kernel release as mentioned at http://www.kernel.org. Can I update to 3.3.1 in Ubuntu without any risk of ...
16
votes
6answers
39k views

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

Upon trying to upgrade from 10.10 to 11.04 all seemed to go well until the restart. This error message is what comes up: Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ...
9
votes
0answers
24k views

How do I get my Broadcom BCM4313 working correctly? [duplicate]

I've installed ubuntu on a Asus 1015 netbook. Everything worked out of the box except for the Wireless adapter, which i had to install with the Additional Drivers application. It apparently installed ...
22
votes
3answers
30k views

How to restore a system after accidentally removing all kernels?

I was trying to delete old kernels, but I must have deleted all of the kernels on my Ubuntu 11.04 laptop. Is there any way to fix this via USB boot or mounting hard drive on another system?
13
votes
4answers
48k views

How can I boot with an older kernel version?

The latest kernel is causing problems with my sound, which worked fine with an older version. As I have only Ubuntu installed, Grub is not getting displayed while booting. How can I manually choose my ...
38
votes
4answers
18k views

How do I install and use flashcache/bcache to cache HDD to SSD?

I want to know if there is anyone who has tried installing and running their kernel built with flashcache or bcache for SSD caching? How did you manage to do it?
15
votes
9answers
28k views

New computer hangs on shutdown/reboot, how to troubleshoot?

My system is working perfectly but it freezes during shutdown/reboot/suspend/hibernate: All windows and the menu bar disappear but the desktop wallpaper remains. It doesn't even show the shutdown ...
13
votes
1answer
24k views

How to downgrade the Kernel on 11.10

Because of the high power usage I'd like to downgrade my kernel in Ubuntu 11.10 to the version used in 10.10 or 11.04. How can I do that and won't it cause any problems?
21
votes
1answer
12k views

Should I upgrade to the “mainline” kernels?

Newer "mainline" versions of the kernel are available from the Ubuntu kernel team, e.g. 3.4 and 3.5, while Ubuntu 12.04 is on 3.2. What are the mainline kernels? Are they better than my existing ...
5
votes
2answers
9k views

How can I install a newer kernel?

I'm running the current stable Ubuntu version (Oneiric) but have issues with the shipped kernel. Newer kernel versions seem to have fixed it, but the kernel-ppa/ppa does not contain the most recent ...
42
votes
2answers
29k views

Can't upgrade due to low disk space on /boot

I try to do do-release-upgrade but then I get: Not enough free disk space The upgrade has aborted. The upgrade needs a total of 25.7 M free space on disk '/boot'. Please free at least an ...
29
votes
4answers
55k views

How can I upgrade the Ubuntu LTS kernel to newer?

I just installed Ubuntu 12.04.2 64-bit on my desktop PC and I see the kernel in System Monitor is 3.5.0-23 but in Ubuntu 12.04.2 in my laptop the kernel is 3.2.0-38. I have already tried to run the ...
11
votes
2answers
22k views

How to blacklist kernel modules?

How do I disable loading of unnecessary kernel modules. Kernel 3.2.4
22
votes
3answers
12k views

What's the meaning of “-pae” at the end of kernel version?

Last time I installed Ubuntu there was a "-pae" at the end of the kernel version in the boot screen. Now that I've reinstalled Ubuntu from the same disk instead of "-pae" there is a "-generic" at the ...
7
votes
11answers
25k views

Virtualbox Kernel driver not installed

I tried to use my Virtual Box and this is the error I received - (I just updated to the new Ubuntu also) and I am VERY new at this Linux OS. Kernel driver not installed (rc=-1908) The ...
12
votes
3answers
6k views

Will final version of 12.04 use the power management changes found in kernel 3.3

I have seen in some version of Ubuntu that instead of making a huge change to update to the latest kernel, they take some of the good stuff out of it, for the sake of stability and put it on a ...
7
votes
6answers
16k views

How do I install BCM4312 wireless drivers? [duplicate]

Possible Duplicate: How to Install Broadcom / STA Wireless card (BCM43XX) completely new to Ubuntu. How do I add Wireless driver for my laptop? I am running a Dell XPS M1330. Right now its ...
4
votes
3answers
40k views

12.04 won't boot from Live CD or USB

My laptop (the only PC left in my home to install Ubuntu 12.04 now that it's out) is not booting from Live CD or USB. I get past the screen with the little person in the circle. but right after that, ...
15
votes
2answers
9k views

What's a simple way to recompile the kernel?

I'm interested in compiling a new kernel under Ubuntu 12.04 x86 64 bit. I found this wiki page which is basically a mirror for this blog and there are a lot of steps (git, etc.) that appear useless ...
31
votes
1answer
22k views

Is “laptop-mode-tools” still relevant for 12.04 and the 3.x kernels?

I'm using Ubuntu 12.04 x64 and trying to choose power management software. Laptop-mode-tools have a lot of features, but the only reason why I'm worry about is that it's manual and config files are ...
9
votes
7answers
16k views

After apt-get upgrade system always boot to low-graphics mode

Some time ago I have installed xorg edgers nvidia 331 drivers for my Nvidia 420M with Ubuntu 13.10. Today I have run like always sudo apt-get update && sudo apt-get upgrade -y && ...
20
votes
4answers
34k views

How can I install a realtime kernel?

I have read a lot of threads with similar questions, but after reading the answers, I am very confused. I have found in them lots of url's with repositories but people discusses about which ...
25
votes
6answers
16k views

High temperature in a AMD Radeon HD4000/3000 series after upgrade

I was running 12.04 with Unity 3D for 6 months; my laptop ran almost silently and cool enough to hold on my lap with ~4 hours of battery life. I updated to 12.10 and switched to the Gnome 3 Shell. Now ...
11
votes
3answers
12k views

How to install newer versions of the Linux kernel?

A new version of the Linux kernel, 3.4, has been released today. How do I install it?
15
votes
5answers
10k views

Where can I find the source code for the Ubuntu Kernel?

I'd like to build my own copy of the Ubuntu kernel. Where can I get the source code?
14
votes
3answers
19k views

Will it be possible to use a non-pae kernel in recent versions of Ubuntu?

I know that Ubuntu +1 questions are frowned upon, but this I believe is a fair exception. Currently I have 2 systems running Ubuntu 12.10, and one of them has a Pentium M that doesn't support PAE ...
55
votes
8answers
131k views

What is the path to the kernel headers so I can install vmware?

I installed the VMware bundle on my Ubuntu 11.04 successfully but when I open it it gives me this window and I don't know the path to this C headers.
26
votes
3answers
42k views

What does the kernel boot parameter “set acpi_osi=Linux” do?

I am facing an issue with brightness control in my laptop which has Intel HD graphics and Ubuntu 10.10 64-bit. So when I searched for a fix I found that a common suggestion is to edit the GRUB file ...
34
votes
3answers
40k views

Can I install Linux kernel in Ubuntu appart of the default one?

Can we install the latest kernel 3.4 in Kubuntu or Ubuntu 12.04 LTS? If not then please clarify the reason.
16
votes
5answers
120k views

Kernel requires an x86-64 CPU, but only detected an i686 CPU. How can I install Lubuntu/Ubuntu?

I'm trying to install Lubuntu on my laptop (sorta old 2005). [Laptop stats: Intel® Celeron® CPU 410 @ 1.46 GHz 1.47GHz, 448 MB of RAM] I press Install and this message appears: This kernel requires ...
14
votes
5answers
1k views

Is it safe to delete the old kernels from menu.lst?

When the computer starts, GRUB shows a long list of previous kernels in addition to the usual stuff, e.g. Ubuntu 10.10, kernel 2.6.35-23-generic Ubuntu 10.10, kernel 2.6.35-23-generic (recovery mode) ...
53
votes
9answers
49k views

Does Ubuntu support USB 3.0?

I have a Western Digital My Book 3.0 - 1 TB USB 3.0 Desktop External Hard Drive, and I wanted to know if it would work on Ubuntu 10.10 Maverick Meerkat.
8
votes
1answer
25k views

How do I get the kernel source code?

I am planning to write some device drivers and I need to get the Linux kernel source. My Linux kernel version is 3.2.0-23-generic-pae and I downloaded the image from this. In many of the articles I ...
8
votes
4answers
10k views

Why did my upgrade to 12.04 fail with “glibc not found” or “libc6” or “requires kernel 2.6.24” error?

I upgraded my server installation form 11.04 to 11.10, then to 12.04 over ssh. All seems almost ok - but there is a small issue with glibc, which is messing up my apt. I tried sudo apt-get install -f ...
21
votes
1answer
5k views

What is hardware enablement (HWE)?

I see the linux-hwe-generic package as part of the kernels you can install in Ubuntu 12.04. What is hardware enablement (HWE)?
12
votes
3answers
18k views

How to enable boot messages to be printed on screen during boot up? [duplicate]

How to enable boot messages, kernel messages and other logs of various services to be printed on screen during boot up?
18
votes
3answers
14k views

Can I update the kernel of my 10.04 LTS to the latest kernel?

I want to update the kernel version of my current 10.04 LTS to at least 2.6.37 (because the drivers for my eth0 and wlan0 interfaces are included in the said kernel). If it is possible, how do I do ...
20
votes
8answers
29k views

What is a “Asking for cache data failed” warning?

I'm installing Ubuntu server 12.04 on Dell laptop and I frequently get an message as below: 3256.362200] sd 5:0:0:0: [sdb] Asking for cache data failed [3256.362200] sd 5:0:0:0: [sdb] Assuming drive ...
4
votes
3answers
3k views

Ubuntu 13.10, kernel still 3.8.0-31-generic

I updated from 13.04 to 13.10 but uname -r still says I am on 3.8.0-31-generic. How can i fix this and get 3.11 or 3.12 ?
21
votes
1answer
8k views

Quantal backported kernel in 12.04.2? What's going on there?

I'm sure that I'm not the first and/or only one to notice that 12.04.2, released earlier this year, installs by default a backported 3.5 kernel from the Quantal (12.10) release. I'm surprised to see ...
10
votes
3answers
9k views

How many maximum CPUs does Ubuntu support by default?

I think this is kernel dependent and probably will change over time depending on the kernel a release uses, correct me if wrong I'd like to know two things for all the currently supported Ubuntu ...
7
votes
3answers
2k views

Reasons why not to update an Ubuntu version to a newer/older kernel version [duplicate]

I had several friends ask me to update their Ubuntu to a newer kernel without changing the version of Ubuntu. So for example, staying in 10.04 with the 3.3 Kernel version. When having an older or ...
7
votes
3answers
18k views

How do I add the mainline kernel PPA?

How can I add the mainline kernel ppa to the synaptic software sources? I have the url: http://kernel.ubuntu.com/~kernel-ppa/mainline/ but I am missing the ppa: line.
60
votes
5answers
29k views

Why is swap being used even though I have plenty of free RAM?

I thought the whole essence of swap was to act as a temporary storage safety net when RAM was full but my swap partition is constantly being used even though I sometimes have as much as 3GB free RAM. ...
18
votes
8answers
58k views

Unable to start VMWare Workstation after upgrade to 13.04

After upgrading to 13.04 I am unable to start VMWorkstation. I get the following message: Before you can run VMware, several modules must be compiled and loaded into the running kernel. ...
18
votes
2answers
12k views

How do I disable the blank console “screensaver” on Ubuntu Server?

How to disable blank screensaver on Ubuntu Server? There's no desktop or X, only console (command-line interface).
60
votes
6answers
10k views

How do we get this magic performance-boosting 200 line patch?

I read today on Phoronix that there is a 200 line patch to the Linux Kernel which dramatically improves desktop responsiveness. How can Ubuntu users get this in a way that's supported?