If you want latest version,which is not available on ubuntu repos, there are following alternate ways of getting it.

• manual download from website


• download from unofficial repositories.


• download and build latest source code.


• download from other linux repository and convert using alien.

Now as you don't want to install manually,lets speak about other methods.

download from unofficial repositories.

once you find the repository you need,open a terminal and type.

sudo add-apt-repository ppa:(Your ppa here)

sudo apt-get update

sudo apt-get install tomcat

NOTE:-

you will first have to temporarily block the repo which contains older version of tomcat,or they will interfere.you can do this by

sudo add-apt-repository -r ppa:(Your ppa here)

and dont forget to add it back, once you are done.

download and build

this link provides the source code.for building and installing software read software documentation/forums and compile easy how to

download from other source

download package using website or any other place.then use alien to convert package.read alien man pagesfor help on using alien.