Ubuntu 8.04 Server

devent · Post by **devent** » 3. May 2008, 03:37

Hello
After the installation I cannot boot into the Ubuntu system.
I search in google and found this:
http://tombuntu.com/index.php/2007/09/0 ... irtualbox/

Ubuntu Server has its own kernel which has PAE (physical address extension) support. This is not supported in VirtualBox and prevents the virtual Ubuntu from booting. Using Ubuntu’s recovery mode it is possible to install another kernel which will work in VirtualBox.

The fix is to install and use the desktop kernel.

Will it be fixed in VirtualBox so I can run Ubuntu server with the server kernel?

Post by **Sasquatch** » 3. May 2008, 11:09

Check the download page, 1.6.0 is released yesterday. It has experimental PAE support.

devent · Post by **devent** » 4. May 2008, 04:06

Sasquatch wrote:Check the download page, 1.6.0 is released yesterday. It has experimental PAE support.

Thx, I still have 1.5.6_OSE. When 1.6.0 will be available as stable than it's ok. I don't need PAE right now.

devent · Post by **devent** » 11. May 2008, 10:02

I just tested 1.6_OSE with Ubuntu8 Server and it still cannot boot with the server kernel.

The kernel requeres the following features not present on the CPU: 0:6

I think 0:6 is PEA. I hope the devs will solve this problem soon

Nille02 · Post by **Nille02** » 12. May 2008, 08:37

For Ubuntu Server use a i386 Kernel not the default i586

sergray · Post by **sergray** » 29. May 2008, 08:43

Sasquatch wrote:Check the download page, 1.6.0 is released yesterday. It has experimental PAE support.

Tested with 1.6.0. Turning on PAE support solved the problem.

Post by **TerryE** » 29. May 2008, 19:23

devent, which kernel are you loading in your build?

I am using the Ubuntu 8.04 JeOS build which has:

$ uname -r
2.6.24-16-virtual

From other posts the 8.04 workstation is build against 2.6.24-17. You should be using the *-virtual kernels in VM guest builds, as these have been optimised for running in a guest VM. This has the other advantage that PAE is not required for this kernel.

Post by **Sasquatch** » 29. May 2008, 23:50

TerryE wrote:devent, which kernel are you loading in your build?

I am using the Ubuntu 8.04 JeOS build which has:
$ uname -r
2.6.24-16-virtual
From other posts the 8.04 workstation is build against 2.6.24-17. You should be using the *-virtual kernels in VM guest builds, as these have been optimised for running in a guest VM. This has the other advantage that PAE is not required for this kernel.

We are talking about the Server edition here, that runs the 2.6.24-server kernel, not the generic. Server is for non graphical use. So 'we' are running the proper kernel. PAE is only a checkbox in the settings.

Post by **TerryE** » 30. May 2008, 03:56

Sasquatch, you missed my point there are more than one Ubuntu kernels tuned for server builds. For the wider readers it might be worth explaining. If we leave aside the debug and 368 kernels, Ubuntu supports the following standard meta kernels:

generic. This has a fine grain timeslice and is really optimised for workstations.
server. This is optimised for servers running on bare metal.
rt. This is optimised for embedded and real-time systems.
xen. This includes support for Xen dom0 and domU.
openVZ. This supports the Parallels OpenVZ project.
virtual. This is optimised for running as a guest in a VM (primarily VMware but the same tuning applies to VBox). One of the advantages here is that it does not require PAE support.

Though the 2.6.24-17 Hardy kernel has recently been released, VBox users are better off sticking with the 2.6.24-16 kernel until the team release the virtualbox-ose modules for 2.6.24-17 (and of course the corresponding linux-ubuntu-modules-2.6.24-16-virtual drivers). So my point is that VBox users should build their server configurations with the linux-image-2.6.24-16-virtual kernel. Suggesting that they use the *-server kernel is bad advice.

BTW: JeOS (Just enough Operating System) is Ubuntu's excellent minimal server build targeted at the appliance sector, so I was also talking servers

teosike · Post by **teosike** » 21. Nov 2008, 19:41

I'm install Ubuntu server 8.10 in VitualBox 1.6 and has check PAE in Advanced setting of VitualBox, but it not run!
Who can fix it, pls post in here for people learn and config!
and then is my error:
Boot from (hd0,0) ext3 0951d6f-332d-42be-b4ac-68783be55a77
Starting up . . .
This Kernel requires the following features not present on the CPU: pae
Unable to boot - please use a kernal appropriate for your CPU.

Post by **Sasquatch** » 22. Nov 2008, 00:59

Either update to at least 1.6.6, or mount the install ISO in the VM, run the "broken system" setup, drop to a shell on the drive and install a different kernel, like the virtual.