ppa: ошибка установки Grails [дубликат]

Я пытался установить Grails с помощью :

sudo add-apt-repository ppa:groovy-dev/grails  
sudo apt-get update
sudo apt-get install grails-ppa

Первая команда возвращает без ошибок:

$ sudo add-apt-repository ppa:groovy-dev/grails
 Grails is an advanced and innovative open source web application platform that
 ...
 More info: https://launchpad.net/~groovy-dev/+archive/ubuntu/grails
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keyring `/tmp/tmpt59mo9/secring.gpg' created
gpg: keyring `/tmp/tmpt59mo9/pubring.gpg' created
gpg: requesting key 02A9EC29 from hkp server keyserver.ubuntu.com
gpg: /tmp/tmpt59mo9/trustdb.gpg: trustdb created
gpg: key 02A9EC29: public key "Launchpad PPA for Groovy Developers" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
OK

Но команда обновления не работает:

$ sudo apt-get update
...
Err http://ppa.launchpad.net saucy/main amd64 Packages
  404  Not Found
Ign http://ppa.launchpad.net saucy/main Translation-en_US
Ign http://ppa.launchpad.net saucy/main Translation-en
W: Failed to fetch http://ppa.launchpad.net/groovy-dev/grails/ubuntu/dists/saucy/main/binary-amd64/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

Есть идеи, почему при обновлении ppa возникает ошибка 404?