Greenfoot 3.6.0 has now been released. The main feature of this release is that it moves to Java 11, which means a few extra notes are needed:

• Greenfoot now requires a 64-bit CPU and 64-bit operating system. Our stats indicate over 95% of our users already have this. If you don't, you will need to stick with 3.5.4.
• To solve Java packaging headaches on Ubuntu, Debian and co, we now include the JDK by default on Ubuntu. This should make it much easier to install for our Debian-derived Linux users.
• The online export to this website has been upgraded to work with code produced by Java 11, but as yet the library we use doesn't have support for new Java 11 APIs. So if you start to use any methods introduced after Java 8 (e.g. the List.of() utility methods), this won't work in the online version.

Other than that, everything should be working as usual. Talking of the online export -- we've also now fixed the GifImage utility class so that it works in the online version. To take advantage of this, install 3.6.0, delete the GifImage class from your scenario, re-import it using the Edit -> Import class menu option, and re-export to the website.