If you have problem with installation on compaq DL or ML servers (i have a ML370) with CompaqSmartArray Raid card, You can’t install ubuntu with normal way; you must use highway :D
Ok here we go;

1st of all you need to make a custom CD ( You can use this one too http://skydisc.de/downloads/ubuntufeistysmartarray.iso)

To create the custom CD…..

Mount the install…

mount /dev/scd0 /cdrom

Copy the CD.

mkdir -p /opt/cd-image
cp -r /cdrom/* /opt/cd-image
cp –r /cdrom/.disk /opt/cd-image

Extract the initrd.gz from the cd image

mkdir extract
cd extract
 
zcat /opt/cd-image/install/initrd.gz | cpio -i

Delete the modules in sym53c8xx_2 directory

rm –rf ./extract/lib/modules/2.6.20-15-generic/kernel/drivers/scsi/sym53c8xx_2

Repack the modified files.

Cd back to to your extract directory

find . | cpio -o --format='newc' |   gzip -9 > ~/initrd.gz.new

Put the new file into our CD replacing the old one.

cp ~/initrd.gz.new /opt/cd-image/install/initrd.gz

Now create the iso image.

 
IMAGE=custom.iso
BUILD=/opt/cd-image/
 
mkisofs -r -V "Custom Ubuntu Install CD" \
            -cache-inodes \
            -J -l -b isolinux/isolinux.bin \
            -c isolinux/boot.cat -no-emul-boot \
            -boot-load-size 4 -boot-info-table \
            -o $IMAGE $BUILD

Burn the image to CD and you should be able to install to your Compaq Smart Array controller.

Installation

1. Boot the install CD. At the splash screen hit [esc] to get the boot: prompt and enter: expert as the only option.

2. Do all the steps up to & including “Install the Base System”

3. After installing the Base System, hit Alt-F2 and enter the console.

4. type:

echo “cpqarray” >>/target/etc/mkinitramfs/modules
*it can be
echo “cpqarray” >>/target/misc/mkinitramfs/modules
or
echo “cpqarray” >>/target/etc/modules
(You must find it out it can be diffrent by versions)
- check to see which one your system is trying to use.

5. Exit the console. Press Alt+F1 to return to the install.

6. Continue the installation steps as normal.

Networking and Upgrade version after installation
You can check this page for network stuff
you must check this page for upgrading

Don’t forget
Your old version’s /etc/apt/sources.list is wrong you must change it like this

deb http://old-releases.ubuntu.com/ubuntu/ feisty main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ feisty-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ feisty-security main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ feisty-backports main/debian-installer
deb-src http://old-releases.ubuntu.com/ubuntu/ feisty-backports main restricted universe multiverse

P.S. there is a bug about update-manager if you get an error until updating version you must
change this file /var/lib/update-manager/meta-release

herefore (on Feisty), edit /var/lib/update-manager/meta-relase and just replace all occurences of:

http://archive.ubuntu.com/ubuntu/dists/gutsy/

with

http://old-releases.ubuntu.com/ubuntu/dists/gutsy/