Packaging:Clersign failed secret key not available

Hi

I'm using 8.04.1 hardy . I'm trying to follow this packaging guide https://wiki.ubuntu.com/PackagingGuide/Recipes/PackageUpdate. I keep getting an error when trying to build the package

gpg: [stdin]: clearsign failed: secret key not available
debsign: gpg error occurred! Aborting....
debuild: fatal error at line 1174:

gpg --list-secret-keys lists my key and user name as same as the error

found a forum with the suggestion to use

debuild -S -rfakeroot -k<your_gpg_key_id>

then i get this error

Building the build Environment
 -> extracting base tarball [/var/cache/pbuilder/base.tgz]
E: failed to find /var/cache/pbuilder/base.tgz, have you done <pbuilder create> to create your base tarball yet?
des@LinuxPC:~/ed$

when i do sudo pbuilder create
i brings up this error at the end

Failed to fetch http://archive.ubuntu.com/ubuntu/dists/hardy/Release Unable to find expected entry multiuniverse/binary-i386/Packages in Meta-index file (malformed Release file?)

E: Some index files failed to download, they have been ignored, or old ones used instead.
 -> Aborting with an error
 -> unmounting dev/pts filesystem
 -> unmounting proc filesystem
 -> cleaning the build env
    -> removing directory /var/cache/pbuilder/build//21207 and its subdirectories

Anybody any ideas?