configure: error: Cannot find MySQL header files under /usr.
You dont have the mysql-dev package of your current mysql version installed. Please install the mysql-dev ubuntu package for your mysql version, then execute:
and unpack the installer tar.gz again and run setup.
You must have (accidently) removed this pacakge after you installed the 2.2.9 version because no ISPCOnfig version compiles without this package.