Hello,
There is no official Ubuntu package for FOP2. I might make one in the future, but it is not advertised nor available. You can try FOP2 for free at your own risk. If a debian package works for you then great! You will be good with the paid version too as it is actually the same binary. But you are right: there is no official ubuntu package, do not buy it i fyou want a package for that distro and you are unwilling to try/fiddle with perl modules/versions.
Even with some distros you will have to fiddle with modules as they are constantly being updated, and some distros come with a debugging perl. That zlib version was released after fop2 was released, there is now also a new perl release altogether. If you happen to update CPAN it will update Zlib (it's a core package). I cannot control perl or modules releases, and its good that they are updated but it will bring complications if you update your perl too.
It would be great to have a ready to run version for every distribution out there.. but the price point in FOP2 is low for a reason.. and currently it is not possible to cover every distro out there for such a small fee.
You can expect a native ubuntu package eventually... Best regards,
