you can download it from here
Or
You can use the rpm package and change to deb via ALIEN
to install alien command on Ubuntu
sudo apt-get install alien
To use alien command to convert rpm to deb file
sudo alien pakage.rpm
Output would be:
package.deb generated
you can use
sudo alien -i package.rpm
this would convert the package from rpm to deb then install it automatically and then it would delete the source.
man alien
will show you how to use
Moreover
see this link that talk how to build the ActiveMQ package