I install xen 4.0.1 on ubuntu-10.04.1-server-i386, and I used the tutorial as bellow:(I want to ask which step is wrong and what shall I do in the make menuconfig)
apt-get install libcurl4-openssl-dev \
xserver-xorg-dev \
mercurial gitk \
build-essential \
libncurses5-dev \
uuid-dev gawk \
gettext texinfo bcc \
libncurses5-dev dpkg-dev debhelper \
iasl texinfo bridge-utils bison flex
apt-get build-dep xen-3.3
cd /usr/src
git clone http://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen
cd linux-2.6-xen
git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x
make menuconfig (I copied all the things in the http://pastebin.com/Ebrsiav7 to the .config. Is that right? )
make -j 1
make modules_install install
chmod g-s /usr/src -R
make deb-pkg
dpkg -i ../linux-image*2.6.32.21*.deb
depmod 2.6.32.21-xen
update-initramfs -c -k 2.6.32.21-xen
gunzip xen-4.0.1.tar.gz
tar -xvf xen-4.0.1.tar
cd xen-4.0.1
patch -p1 -s -i ../grub2-fix.patch1
make xen
make tools
make install-xen
make install-tools PYTHON_PREFIX_ARG=
update-rc.d xend defaults 20 21
update-rc.d xendomains defaults 21 20
Reboot in Xen with grub entry.
Please I make xen 4.0 once and once again , somebody help!!~. | 
