We are experimenting with producing different series of packages for SchoolTool each year, in an effort to make the transition between major releases clear. Schools generally do not and should not want to deploy new releases during the school year.
Thus we have schooltool-2008 and schooltool-2009. As of April 2009, the two are exactly the same, and we recommend moving to schooltool-2009 at your convenience by doing the following:
$ sudo apt-get remove schooltool-2008
$ sudo cp /var/lib/schooltool/schooltool-2008-Data.fs /var/lib/schooltool/schooltool-2009-Data.fs
$ sudo apt-get install schooltool-2009
The second step copies the database to a new location. If you don’t do that, schooltool-2009 will start with a blank database. This may cause you to briefly panic. We do this to help ensure that a bug in the upgrade process will not automatically clobber your existing database.
Also please note that when you upgrade from one version of Ubuntu to another, you should also change the distribution version of your SchoolTool PPA on Launchpad to match the name of the new Ubuntu distribution.