The Ubuntu developer now officially decided to postpone the upcoming Dapper Drake release to 1st July 2006. That is 6 weeks later than planned. Therefore the version number will be changed to 6.06. In the future the decimal point will most probably be changed to a hyphen, because most of the developer find the decimal point irritating.
So let's wait for Ubuntu Dapper Drake 6-06 on 1st July 2006 :)