The stage 3 tarball lacks a "portage" user and group, for some reason, which will cause emerge to fail from inside the chroot. If you use schroot you will have to create the portage user and group on your host system (ubuntu lucid in my case) the passwd and group files in /mnt/gentoo/etc will be overwritten if you modify them directly. and if you restart the machine for some reason the contents in the /mnt/gentoo/usr gets deleted permanently.
1) Please set the URL for the stage3 tarball you used in the [URL] field. 2) Please post your `emerge --info' (from within the chroot) output too.
Created attachment 270793 [details] using this configuration, password and group files will not be overwritten. Using this configuration and After adding the portage user & group to the host system chrooting in the ordinary way should also work with network access.