Cannot add FWTS PPA

[wufan]

~# add-apt-repository ppa:firmware-testing-team/ppa-fwts-devel
Cannot add PPA: 'ppa:firmware-testing-team/ppa-fwts-devel'.
Please check that the PPA name or format is correct.

[Colin Ian King (colin-king)]

wufan, which release are you using?

[wufan (wufan)]

It's a special 14.04 LTS release. I just tried ppa-fwts-stable and that seems to be working. You can close the bug. Thanks!

[Colin Ian King (colin-king)]

I think the root cause of this is something to do with the following (this is what I get when running sudo apt-get update)

W: The repository 'http://ppa.launchpad.net/firmware-testing-team/ppa-fwts-devel/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Failed to fetch http://ppa.launchpad.net/firmware-testing-team/ppa-fwts-devel/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/firmware-testing-team/ppa-fwts-devel/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.