I believe that enabling or disabling ipv6 on install or in the network management application should be an option. With appropriate warnings about future compatibility and current performance issues.
In trying out Ubuntu 6.10 Edgy-Eft I found Internet access with Firefox extremely slow to non-existent and I was ready to dump Ubuntu. However being the curious human I am, I decided to not give up. Thanks to the forum list and multiple references to turning off ipv6 through the blacklist I was able to resolve the problem. My DSL modem only supports basic DHCP and DNS options and has NO support for IPV6 configurations. I found ipv6 to be a problem under Fedora also, so it is not just Ubuntu that is having issues with this problem. Ubuntu and Linux almost lost a Techie to this problem. Have not doubt that an inexperienced user will dump Linux in a heartbeat if this isn't resolved in the distributions. DFincher Info. Sys. Admin -- IPv6 should be disabled by default https://launchpad.net/bugs/24828 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs