how can I install real time kernal on ubuntu 11.10

[forsubhi]

I have kubuntu 11.10 and I read that I have to execute this command to install realtime


sudo apt-get install linux-image-rt linux-headers-rt

but

sudo apt-get install linux-image-rt

don't work and give me the message

E: Package 'linux-image-rt' has no installation candidate

what is the problem ?

[Sylos]

Hello there.

The rt kernels are not in the standard repos IIRC. You need to add alesio Boganis ppa to get at them.

See here for the ppa:

https://launchpad.net/~abogani/+ppa-packages

Cheers

[jerome1232]

Hello there.

The rt kernels are not in the standard repos IIRC. You need to add alesio Boganis ppa to get at them.

Cheers

Wow! When and why did that happen? Doesn't Ubuntu Studio need those kernels?

[forsubhi]

thank you very very much Sylos
I'll try it

[forsubhi]

I execute
sudo add-apt-repository ppa:abogani/realtime
then I execute
sudo apt-get linux-realtime
and then I get the following problem

http://img7.imagebanana.com/img/92og50bw/Selection_031.png

[forsubhi]

I think this is helpful when I execute sudo apt-get

Err http://ppa.launchpad.net oneiric/main Sources
404 Not Found
Err http://ppa.launchpad.net oneiric/main amd64 Packages
404 Not Found
Hit http://archive.ubuntu.com hardy-updates Release
Err http://ppa.launchpad.net oneiric/main i386 Packages
404 Not Found

[forsubhi]

this also appear
in sudo apt-get update

W: Failed to fetch http://ppa.launchpad.net/abogani/realtime/ubuntu/dists/oneiric/main/source/Sources 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/abogani/realtime/ubuntu/dists/oneiric/main/binary-amd64/Packages 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/abogani/realtime/ubuntu/dists/oneiric/main/binary-i386/Packages 404 Not Found

[forsubhi]

how can I use
http://ppa.launchpad.net/abogani/realtime/ubuntu/dists/precise/main/source/Sources
instead
http://ppa.launchpad.net/abogani/realtime/ubuntu/dists/oneiric/main/source/Sources

[Sylos]

Hello there. Sorry for the tardy reply - i had to get some sleep.

Before you tried to install did you update the sources list with "sudo apt-get update"?

I'll keep an eye out on this thread throughout the day.

Cheers

[Sylos]

Wow! When and why did that happen? Doesn't Ubuntu Studio need those kernels?

Not sure - I know the current Ubuntu studio doesnt ship with Real Time kernel. Supposedly there have been advances in the generic that allow reasonable performance at low latency. Personally I like rt kernels, even though they may be a little behind the current generic.

Anyhow as I said, IIRC, ....so I could be wrong!

[forsubhi]

yes I execute the
sudo apt-get update
but I use kubuntu 11.10 , is there problem with that ?

[Sylos]

There shouldnt be a problem with using Kubuntu.

Could you try opening Synaptic package manager and search for the RT kernel from there?

[forsubhi]

when I open Synaptic message appear showing me problem like this
http://img7.imagebanana.com/img/92og50bw/Selection_031.png

then I search for rt and found this
http://img6.imagebanana.com/img/d8p84drr/Selection_032.png

What should I do now ?

[Sylos]

Ok.

So the third line down appears to be latest RT kernel available. I would say select and install it.

A couple of things to note: Dont remove any older kernels - if the new one fails or lacks something you need you want to have the trusty old one to fall back on.

Also, if you havent done this before you may not know that you will want to select the new kernel in the GRUB boot menu. It will normally be the first on the list unless you have set up GRUB differently.

Let me know how you get on.

EDIT: As far as the errors are concerned they appear to be based on hardy repos. Hardy went end of life years ago and so the repos will no longer exist - hence the errors. Did you add these repos yourself?

[forsubhi]

I think that I confuse you ;

I face this new errors
http://img7.imagebanana.com/img/uqbtw345/Selection_033.png


and if I use ubuntu software center

The following packages have unmet dependencies:

linux-rt: Depends: linux-image-rt (= 2.6.24.31.33) but it is not going to be installed
Depends: linux-restricted-modules-rt (= 2.6.24.31.33) but 2.6.24.31.33 is to be installed

http://img7.imagebanana.com/img/txo1y9o4/Untitledwindow_034.png

What should I do ? ](*,)](*,)

[forsubhi]

this error appear when I try to install linux-restricted-modules
http://img7.imagebanana.com/img/e5ww7j47/Untitledwindow_035.png

[forsubhi]

Note : I try to install linux-image-2.6.24.27-rt and I see it when I restart but when I select it the computer hanged and didn't complete boot process

[Sylos]

Hmm that is not what I was expecting.

I have to bail for the night now - but could you post up what software sources you have in use? I will try and look in again tomorrow.

Cheers

[forsubhi]

I didn't understand what do you mean by software sources , can you explain more ?

[forsubhi]

Is this helpful page ?

http://img7.imagebanana.com/img/7tpbpeud/Selection_039.png

[Sylos]

Hello again.

You could certainly download the kernel package from the PPA and install it - although the page your screen shot appears to show is for Precise - the version after 11.10 which you mentioned in the title of the thread. You would want Oneiric.

I am a little concerned as to why you have a broken package system. I think we should try to fix this.

Try the following:

Open Synaptic.
Choose Edit > Fix Broken Packages from the menu.
Choose Apply Marked Changes from the Edit menu or press Ctrl + P.
Confirm the summary of changes and click Apply.

The software sources I mentioned in my previous post are the PPAs that you have enable from which you download the software with apt-get or synaptic. I wondered if the hardy ppas you appear to have could be causing your trouble.

Try the fix above and let me know what happens.

Cheers

[forsubhi]

I execute
sudo add-apt-repository ppa:abogani/realtime

then when I open synaptic, there is no broken packages, and when I select linux-rs to be installed and Choose Edit > Fix Broken Packages from the menu , this error appear
http://img7.imagebanana.com/img/xlwlks55/Selection_040.png


is there no real time for Oneiric or What ?
and what is the difference between linux-rt and linux-image-2.6.24-30-rt which I installed it

see this
http://img7.imagebanana.com/img/ckbtkovv/Selection_041.png

and could I install hardy software and how ?

[forsubhi]

I remembered that I add ppa:abogani/broken to my repository and I have Question about linux-lowlatency is it helpful for real time

in the https://launchpad.net/~abogani/+ppa-packages (https://launchpad.net/%7Eabogani/+ppa-packages)
there is a lot of ppa , did I choose the correct one ?
ppa:abogani/realtime

I want to install rtsj on ubuntu 11.10 and that's All , if there is another way to do that please tell me.

[Sylos]

Ok.

I have just had a look at the Oneiric rt kernel entry on Boganis Launchpad PPA page - This particular ppa is designated "broken" and has a message saying "never use". So I guess you should remove it from your list.

It does appear that there are no working rt kernel packages for Oneiric - Im sorry i didnt know this (I use 10.04 Luci Lynx for my studio set up). I also wouldnt have thought the broken packages would have been available through synaptic.

It seems that most of the ppas are broken - the only ones with an RT kernel that arent broken are for precise.

It is possible to build a kernel with the RT patch yourself using the vanilla kernel source but I have to be honest and say I would be out of my depth to help you if it went wrong. So Im not going to recomend you do it. Feel free if your brave and dont have valuable info that could be lost.

Not sure what would happen if you tried to install the precise rt kernel - theres liable to be some incompatible code in their. As far as I am aware if it fails then your system would just fail to boot into that kernl - your old kernel should still work. BUT THIS IS JUST WHAT I THINK IS THE CASE - kernels are normally pretty self contained so shouldnt mess with anything else - BUT TRY IT AT YOUR OWN RISK.

Sorry to have turned out not to be very helpful - I tried my best but my knowledge is limited.

Best of luck.

[forsubhi]

thank you friend
I'll try to install 12.04 beta 2
Do you recommended this or not ?

[Sylos]

I dont have any experience of using it. The final release date isnt until April 26th so you could experience some breakage between now and then but I guess the only way to find out will be to try.

I know that as far as Ubuntu Studio is concerned, many people have been recommending use of 10.04 over the newer releases due to bugs and performance issues - but others have been quite happy with the newer releases - I assume it depends on what you are doing and whether your hardware is working ok.

Why are you trying to use the RT kernel? Have you tried using the vanilla kernel? You could find that it works ok for your purposes depending on what you do with it. Also, if you are having problems with it you could start a specific thread in the Ubuntu Studio section of the forum - people with a LOT more knowledge and experience than me frequent there and may be able to help with configuration and optimisation.

I recently installed 10.04 on my newly built rig and was able to easily install the preempt kernel (this is know as a soft real time kernel rather than the RTKernel which is a hard realtime kernel - I cant explain the difference Im afraid). Sadly I appear to have a faulty motherboard that Im trying to get replaced so I havent been able to do full testing but the kernel installed fine without breakage and and appear to be able to run the system satisfactorily.

There are issues with using such an old release and kernel - security fixes and some newer features may not be available. I dont run it as my main system - I dual boot Ubuntu 11.10 and Ubuntu Studio 10.04 - I only use studio 10.04 for audio production so Im not too concerned by security issues as anything security critical is done on the up to date 11.10 system.

If you can use the vanilla kernel without issues then for now I might be tempted to stay with it until Precise 12.04 comes out and is stable - then maybe try moving up to it.

[forsubhi]

thank you for your effort