samba server package installs a "homedir" /home/samba that is included in cpio archive. If a customer have an nfs-mounted home directory (via automount, very common for Solaris, for example), installing samba on "non-root" machine will fail with message "unable to create /home/samba"). This is a some general question -- why samba need that directory?!
Removed in samba-2.0.5a-14, in the next Raw Hide release.