build a customized ubuntu live cd

[Matteo Brunettini]

Hi,
I'm trying to create a customized version of the Ubuntu 14.04 LIVE CD, using the live-build scripts  as follows :
                lb config --archive-areas "main universe" --distribution "trusty" --mode "ubuntu"
                lb build
This produces a live iso image that does not boot, I receive the following error:
/casper/vmlinuz : file not found

If I force GRUB as boot loader, as follows:
                lb config --archive-areas "main universe" --distribution "trusty" --mode "ubuntu" -botloader "grub"
                lb build
the build step does not complete, it stops with the following error:
E: Package 'grub-legacy' has no installation candidate

Can anyone help me?
Thanks a lot!

matteo
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