I have an Ubuntu 7.10 slice on Slicehost running my main web server. I want to update to Ubuntu 8.10 because the repositories are gone for 7.10 and I want the latest security and application upgrades.
Slicehost does not seem to let me dist-upgrade from 7.10 to 8.10, they suggested I buy a new VPS slice, upgrade it to what I need, port my data over, and then reimage my original slice from the 2nd slice. Has anyone else done this? Any better way to do it or pitfalls to watch out for while doing this? How long will my site be down if I use this method? Can I finish it in 2 hours on a Saturday?