To download, there are 2 PPA's available:

1. Stable: https://launchpad.net/~fs-icons-ubuntu/+archive/ppa
2. Unstable/daily: https://launchpad.net/~fs-icons-ubuntu/+archive/unstable

To install FS Icons Ubuntu with all of its icon sets, run the following commands:

1. For stable: "sudo add-apt-repository ppa:fs-icons-ubuntu/ppa"
    For unstable: "sudo add-apt-repository ppa:fs-icons-ubuntu/unstable"
2. "sudo apt-get update"
3. For stable: "sudo apt-get install fs-icons-ubuntu fs-icons-ubuntu-mono-dark fs-icons-ubuntu-mono-light"
    For unstable: "sudo apt-get install fs-icons-ubuntu fs-icons-ubuntu-mono-dark fs-icons-ubuntu-mono-light fs-icons-ubuntu-sky-mono-dark fs-icons-ubuntu-megypt-mono-dark"

Step 3 will install all icon sets, but the sets "fs-icons-ubuntu-sky-mono-dark" and "fs-icons-ubuntu-megypt-mono-dark" are not available in the stable PPA yet.

If you would like to see a new icon for an application included in FS Icons Ubuntu, first head over to https://bugs.launchpad.net/fs-icons-ubuntu/+bugs?field.tag=icon-request and make sure nobody has already filed a bug for the new icon. If you don't see any bugs that are related to the one you're thinking about filing, please file your bug report by going to https://bugs.launchpad.net/fs-icons-ubuntu/+filebug, and please file separate reports for each icon request. Things to include in the bug report:
- Name of the program
- If possible, the original icon (generally found in /usr/share/pixmaps/)