I do not like Ubuntu 11.10 can I go back to Ubuntu 10.10?

Many people don't like the new nity interfaced that was first introduced in Ubuntu 11.04 but luckily, many other linux distro are based on ubuntu so instead of going back to either 10.10 or 10.04, I suggest you take a look at elementary OS (www.elementaryos.org), linux mint (www.linuxmint.com), lubuntu (www.lubuntu.net) or xubuntu (www.xubuntu.org).
All these are operating system built on ubuntu so you will be familiar with how it all works but you won't have to deal with the Unty interface you don't like from Ubuntu 11.10.