Live Build Unable to locate package linux-image-*

[Luigi Cirillo <appost2@gmail.com>]

Hello, I am trying to build a custom live starting from debian standard live.
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lb config --config git://live-systems.org/git/live-images.git
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I changed the config file:
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lb config noauto \
   --clean \
   --ignore-system-defaults \
   --mode debian \
   --debian-installer live \
    --architectures i386 \
   --linux-flavours "486 686-pae" \
   --linux-packages "linux-image linux-headers" \
   --source "true" \
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But "lb build" return
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Package linux-headers-686-pae is not available, but is referred to by
another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Unable to locate package linux-image-486
E: Unable to locate package linux-headers-486
E: Unable to locate package linux-image-686-pae
E: Package 'linux-headers-686-pae' has no installation candidate
P: Begin unmounting filesystems...
P: Saving caches...
Reading package lists...
Building dependency tree...
Reading state information...
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Why the kernel is missing?

I am using live-build 3.0.5-1 on Debian Wheezy amd64
Thank You