IPv6 if up fails on Ubuntu 7.10 linode
This is an issue on linodes since even on the Xen beta boxes, ipv6 support is compiled into the kernels.
edit /etc/modprobe.d/local (create it if it doesn't exist) and add the line:
install ipv6 /bin/true
which basically tells modprobe to run /bin/true instaed of trying to actually load the module.