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

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2
votes
1answer
3k views

Grub is not presenting kernel 3.2 as an option

I'm running Ubuntu 12.04. This morning after a long-overdue reboot for a long-pending kernel update, I discovered that I could no longer start up any VirtualBox machines; long story short, this lead ...
3
votes
2answers
2k views

How do I install 10.04 on a Vortex86DX embdedded system?

I am trying to install Ubuntu on a Netcom NC-499 board that contains a Vortex86DX processor. The processor vendor claims support for Ubuntu 10.04 but I am having problems installing it. I am trying to ...
0
votes
1answer
421 views

How do I change the number of kernels that stay on boot menu?

I'm having an issue with the current kernel and was recommended to install the newest mainline kernel. However, with only two kernel boot options (3.2.0-24 and 3.2.0-25) I'm afraid I'll lose the ...
0
votes
1answer
2k views

How works a loop device (especially a mounted OS Image)

I know, it's a often asked question on many boards and I have read the wikipedia article. But those articles aren't satisfactory. I want to know it because I have Ubuntu 12.04 for Android on my ...
1
vote
1answer
2k views

Why can't 'grub-mkconfig_lib` be opened, preventing a kernel upgrade?

I try to update my Ubuntu 12.04 and I have this error, then it update kernel. Any clue what I can do to fix this? sudo apt-get -f install Reading package lists... Done Building dependency tree ...
31
votes
4answers
75k views

How do I clean or disable the memory cache?

After the system starts, in a few minutes my memory cache fills up and it starts using the swap. Here's a screenshot of /proc/meminfo. However, if I can disable this process / clean the cache once ...
1
vote
1answer
3k views

Can't uninstall Vmware player 4.0.3

I have vmware palyer 4.0.3 installed on ubuntu 12.04 with kernel 3.3.6. For some reasons the network doesn't work on it ( maybe because of the kernel) I tried to uninstall the vmware player using ...
0
votes
1answer
914 views

How do I return to a previous kernel? [duplicate]

I downloaded and installed the 3.0.0-21 update to the kernel. It caused several problems including: Firefox not asking for a folder before placing a URL into bookmarks Ubuntu 11.10 not automatically ...
1
vote
2answers
12k views

Error message “E: unable to locate package firmware-b43-installer” [duplicate]

I am using an Acer Aspire 5002WLMi laptop and set up a dual boot with Windows XP and Ubuntu 12.04. Wi-Fi is working well in Windows XP, but when I start Ubuntu I will get the below error. [ ...
2
votes
1answer
2k views

After installing mainline kernel 3.4.3, why can't I build the AMD graphics binary module? [closed]

I recently updated my Ubuntu 12.04 kernel to 3.4.3-generic, and now my ATI/AMD drivers will not install correctly. AMD Catalyst Control Center is there, and I can open it fine, but it only shows 2D ...
1
vote
1answer
2k views

Root directory of the kernel

A newbie here. I am trying to set up Eclipse for Linux Kernel Programming. The guide says set the project location as the root directory of the kernel. Where's the root directory of the kernel now? ...
24
votes
2answers
21k views

How can I tell if I am out of inotify watches?

I use an application that consumes inotify watches. I've already set fs.inotify.max_user_watches=32768 in /etc/sysctl.conf but last night the application stopped indexing unless I ran it manually, ...
0
votes
1answer
508 views

Why did Unity stop working after I upgraded to the 3.4.3 mainline kernel?

I installed the latest Linux kernel (3.4.3). After rebooting, it says I am in Ubuntu 2D. How do I either go back to my previous kernel, or fix this problem? Thanks. $ uname -r 3.4.3-030403-generic
1
vote
2answers
8k views

VFS: Cannot open root device [UUID] or unknown-block(0,0) / Kernel panic not syncinc VFS

I am running Ubuntu 11.10 x86-64 in Virtual Box. While shutting down the last time the system ran normally, it seemed to have hung up, so I just killed the system. When I wanted to boot it again, ...
2
votes
1answer
434 views

Why is lowlatency kernel not being updated in parallel with the generic kernel?

All, Any idea when we'll see updates to the lowlatency version of the Ubuntu 12.04 kernel? It is still stuck at 3.2.0.23 whereas the generic kernel is already several updates ahead of it at a version ...
2
votes
4answers
1k views

Overheating laptop [closed]

i've been using ubuntu for ~2 months, when i installed it on my computer (laptop) it never overheat but a day, i don't know what happened, it over heated.. (70*C @ Idle) I've tryed what ever i found ...
28
votes
5answers
21k views

Will Linux Kernel 3.5 be coming to 12.04?

I'm wondering if Kernel 3.5 or 3.6 will be available for Ubuntu 12.04 when the Kernel is officially released?
19
votes
0answers
40k views

How to remove kernels from previous release? [duplicate]

Possible Duplicate: Is there a way to remove/hide old kernel versions? I upgraded my Ubuntu 11.10 system to 12.04 using a CD. After upgrading I try to remove old version kernels that appeared ...
2
votes
2answers
296 views

Shall I download updates from kernel 3.2. when I already installed 3.4.3?

I am using Ubuntu 12.04 and due to the weak support of hybrid graphics in the originally distributed kernel (I think it was 3.2) I updated the kernel to 3.4.3 today. But the system is still ...
2
votes
3answers
935 views

Can I use the 2.6 kernel provided with my embedded system to run 12.04?

In summary I am quite new to Linux, but have the task of writing some software. The software has to run on a particular hardware board and the manufacturers of this board have provided a custom build ...
34
votes
2answers
30k views

What is the linux-image-extra package for and do I need it?

I occasionally update my kernel from this web site http://kernel.ubuntu.com/~kernel-ppa/mainline/ I have been always downloading 3 deb files for installing linux header all, linux image and linux ...
2
votes
1answer
640 views

Is this a kernel panic or a kernel oops?

This is a photo I tried accessing my /var/logs, but I'm unsuccessful. Is this a panic or an oops? It has happen about 3 times in 24 hours. Could it be due to a corrupt media? The Ubuntu server install ...
3
votes
1answer
3k views

How to fix “apt-get upgrade” errors?

I get these errors when I try to upgrade the packages installed on my Ubuntu system: m@m-desktop ~ $ sudo apt-get upgrade Reading package lists... Done Building dependency tree Reading state ...
0
votes
1answer
120 views

Development environment for Linux wireless using sparse

I am used to Eclipse and Visual studio for development for Java and C#. I am looking forward to modify and compile some files in C in the Linux Wireless subsystem. The site recommends using Sparse but ...
1
vote
3answers
5k views

How change what kernel boots Ubuntu XEN VPS?

I have a VPS running Ubuntu server 12.04. A while ago, my host installed an alternative kernel (one of Amazon's EC2 kernels) to fix a boot issue I was having. Now, 2 Ubuntu releases later, this kernel ...
15
votes
1answer
2k views

Is there ongoing work in the kernel team to improve battery life under linux?

I have read in some forums that the kernel team is working on improving battery life and energy efficiency in Linux. Unfortunately our community really lags behind Windows and Mac in that regard. I ...
1
vote
1answer
2k views

How to install a download .tar.bz linux kernel?

I have downloaded the latest stable linux kernel release from this site kernel.org My question is, how do I install it in Ubuntu 12.04?
5
votes
1answer
2k views

How do I upgrade my kernel on the Rackspace Cloud?

I'm running servers on the Rackspace Cloud -- the first-generation one, not the next-generation Open Stack one. I believe it's running Xen for the hypervisor. I use the stock images from Rackspace. I ...
3
votes
1answer
865 views

Wireless Stopped working after 3.2.0-25 upgrade

Today, I downloaded the 3.2.0-25 kernel as suggested by Software Update. After restart, my wireless isn't working, doesn't even show up in the Network Manager. If during boot, I choose the previous ...
0
votes
2answers
344 views

GRUB configuration not responding

Recently, I tried to reconfigure GRUB to boot kernel 3.2 instead of 3.4, but by booting, GRUB is not responding to any changes I make in the grub.cfg file. Editing /etc/default/grub and updating it ...
3
votes
2answers
3k views

How do I fix “sorry, a problem occurred while installing software blcr-dkms”?

I have Ubuntu 12.04 running smoothly without any problems. Until recently, I have been receiving this pop-up stating sorry, a problem occurred while installing software Package: blcr-dkms Ubuntu ...
9
votes
1answer
7k views

How to replace a PAE kernel with non PAE Kernel?

After reading the information from my Question pros/cons of PAE , i want to remove PAE kernel because i don't need them . I know removing a kernel from Synaptic Package Manager . Thats easy job but ...
8
votes
3answers
17k views

For a 32-bit kernel, what are the pros/cons of PAE vs. non-PAE?

I am using Ubuntu 12.04 32-bit. My kernels are PAE kernels. I know these are the kernels we can use for 32-bit OS which have 4 GB RAM, to utilize all 4GB of RAM. My system is a 32-bit system. So I ...
9
votes
4answers
9k views

Linux and windows kernel [closed]

I work on Linux and a friend on a Windows 7. I was amazed about the speed that NetBeans, Eclipse, pgAdmin and other programs open a lot, really, a LOT faster on Linux than on windows. What is the ...
4
votes
1answer
430 views

What is the differences between Ubuntu existing kernel vs rt kernel?

What is the differences between Ubuntu existing general kernel of 11.10 vs so called linux rt kernel? does audio delay depends on general kernel vs rt kernel? Where some audio capture looks like it ...
6
votes
2answers
18k views

Missing vmlinuz from /boot

I am running a laptop with Windows 7 and Ubuntu 12.04. I had grub issues following a partition resize which were eventually found to be problems due to missing kernel files. (These problems did not ...
4
votes
2answers
2k views

How do I install a non-PAE kernel on PAE-enabled hardware for Ubuntu 12.04?

I need to install a non-PAE kernel for a 64-bit machine that supports PAE. 32-bit 12.04 currently comes with a PAE kernel but I need to get a non-PAE kernel. An older version of Ubuntu is also ...
2
votes
1answer
558 views

Ubuntu hangs after replugging the modem

I am facing this issue on Ubuntu 12.04, which is for my Wimax modem with beceem chipset. If I replug the device Ubuntu goes in hang state. Its happens very often. If I plug the USB and restart it ...
0
votes
1answer
3k views

Why nvidiabl module is not working in precise?

I've just installed nvidiabl module from https://github.com/downloads/guillaumezin/nvidiabl/nvidiabl-dkms_0.74_all.deb and screen brightness still is not changing. I have NVIDIA G210M, Precise amd64, ...
1
vote
1answer
766 views

Fresh install of 12.04 Kernel panic

I am attempting to install Ubuntu 12.04 on my computer. After the Ubuntu splash screen, the computer throws up this error: sr 2:0:1:0: [sr0] Unhandled error code Kernel panic - not syncing: Attempted ...
2
votes
2answers
4k views

How to delete kernel entries in the Grub 2 menu whose kernels are removed?

I executed the shell script given in How do I delete kernels from a server?. It deleted old kernels but not their associated kernel entries in the Grub 2 menu. For example, the shell script did not ...
2
votes
4answers
3k views

How do I prevent iptables from loading on boot?

I don't need iptables on my computer, since I'm behind a NAT Server and a router. I, therefore, flushed all the rules I had left to disactivate the firewall. I'm wonder if I could probably prevent ...
0
votes
1answer
600 views

Linux header files referenced by mac80211 missing

I am using kernel 3.2.0-24-generic. I need to modify source files of ath9k and mac80211. One of the files in mac80211 refers to a few linux header files such as linux/slab.h, linux/skbuff.h, linux/...
4
votes
2answers
6k views

Disable Ethernet permanently to speed up boot time

I do not use the wired Ethernet Card. It seems to me that, Ubuntu is always trying in boot time to check the network via eth0, Which consumes some times and I guess this may slow down the boot process ...
3
votes
1answer
2k views

Why is the kernel module cfg80211 also listed as a kernel process [cfg80211]?

I do not understand why the kernel module cfg80211 is also listed by ps aux as shown below: $ ps aux | grep cfg80211 root 521 0.0 0.0 0 0 ? S< 16:09 0:00 [cfg80211]
8
votes
3answers
33k views

How to change default scaling governor back to ondemand

After playing with GRUB profiling and installing preload, default scaling governor suddenly becomes 'performance' not 'ondemand'. I tried to enable /etc/init.d/ondemand service, but nothing changes - ...
1
vote
1answer
296 views

Why does trying to build a kernel module give me a “-1 Unknown symbol” error?

I recently purchased a Kinect for Windows and quickly discovered that the camera drivers included in linux kernel 3.0+ aren't compatible with the Kinect for Windows hardware revision. After looking at ...
4
votes
1answer
2k views

Is an ACPI GPE storm normal in an Ubuntu session?

In a previous question (What is an ACPI GPE storm?), I asked about ACPI GPE storm. Looking closer to my kern.log file in /var/log/, I notice that in every session at some point (usually withing 20' ...
2
votes
2answers
49k views

Help do I install the Ralink RT3070 wireless driver?

I bought an AZTECH WL562USB wireless adapter and am stuck trying to install the driver. The driver file I downloaded is a BZ2, called 2011_0719_RT3070_RT3370_RT5370_RT5372_Linux_STA_V2.5.0.3_DPO....
7
votes
1answer
4k views

What is an ACPI GPE storm?

Just experienced a system freeze (no touchpad, no keyboard, screen looked normal), Alt/SysRq/REISUB didn't work, had to press the start button. In /var/log/kern.log I find: ACPI: EC: GPE storm ...