d-i compilation fails

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I'm trying to create an Ubuntu alternate custom CD by following this wiki:

http://wiki.debian.org/DebianCustomCD

When I try to compile debian-installer by running the following as root:

make all_build

I get this error:

Unpacking libslang2 (from udebs/libslang2.udeb) ...
dpkg (subprocess): unable to execute new pre-installation script: No such
file or directory
dpkg: error processing udebs/libslang2.udeb (--unpack):
 subprocess pre-installation script returned error exit status 2
dpkg (subprocess): unable to execute new post-removal script: No such file
or directory
dpkg: error while cleaning up:
 subprocess post-removal script returned error exit status 2
Errors were encountered while processing:
 udebs/libslang2.udeb

If I try to do the same as a normal user:

fakeroot make all_build

I get this error:

Unpacking libslang2 (from udebs/libslang2.udeb) ...
dpkg (subprocess): failed to chroot to `./tmp/cdrom_isolinux/tree':
Operation not permitted
dpkg: error processing udebs/libslang2.udeb (--unpack):
 subprocess pre-installation script returned error exit status 2
dpkg (subprocess): failed to chroot to `./tmp/cdrom_isolinux/tree':
Operation not permitted
dpkg: error while cleaning up:
 subprocess post-removal script returned error exit status 2
Errors were encountered while processing:
 udebs/libslang2.udeb

Can anybody help me with this please?
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