I'm trying to install / compile ROS on Unbutu 14.10, but it seems it's not supported?

Correct, at least not yet. See REP-003 for the list of supported Ubuntu platforms. Indigo is supported on Ubuntu Trusty. ROS Jade will support both Ubuntu Trusty (14.04) and Ubuntu Utopic (14.10) (and Vivid).

I wonder how different it is from 14.04?

Different enough to only be considered for Utopic.

rosinstall_generator desktop_full --rosdistro utopic --deps --wet-only --tar > utopic-desktop-full-wet.rosinstall

The argument is called rosdistro, but you are supplying it with the name of an Ubuntu distribution. That won't work.

Decide for yourself with ROS distribution you want to install, and replace utopic with the codename of the ROS distribution (ie: groovy, hydro, indigo, or jade). Note that only Jade is 'designed' to work on Ubuntu Utopic, the others are too old. Jade has not been released though, so it may not be complete.

I wonder if 14.10 will be supported soon, [..]

See my earlier comment about ROS Jade.

[..] if there is an easy way to make this work?

A from-source install is an option, but I'm not sure whether that can be considered easy. If Indigo's dependencies on Utopic are similar enough, things may work.

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Hi, I had the same problem as you did. I was on 14.10 and I tried to install ros-indigo but without any success. There have been suggestions that you can compile ros from source. However doing this might cause further problems later on when you will try to use other packages and so forth. I downgraded to 14.04 LTS.

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i installed on 14.10 using http://wiki.ros.org/indigo/Installation/Source . the rviz package would not build so i had to include CATKIN_IGNORE file in /src/rviz and a few other dependent packages. ros seems to be running fine for me.

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