What is "Ubuntu Desktop USB" in tasksel?
What is Ubuntu Desktop USB tasksel alternative in ubuntu server 11.10 edition?
This appears to be a bug that snuck into the seeds that were used to build ISO's for Ubuntu 11.10, presumably fairly late, as it was not caught in the fairly comprehensive beta ISO testing.
https://bugs.launchpad.net/ubuntu/+source/tasksel/+bug/869796
The task option itself is not really useful, and shouldn't be seen there.