root@maas:~# apt-add-repository ppa:maas-maintainers/stable
 *************** THIS PPA HAS BEEN DEPRECATED ***************
The use of this PPA has been deprecated. This PPA will no longer hold new upstream releases. Users are highly advised to stop using this PPA in favor of: ppa:maas/stable
 More info: https://launchpad.net/~maas-maintainers/+archive/ubuntu/stable
Press [ENTER] to continue or ctrl-c to cancel adding it
^CTraceback (most recent call last):
  File "/usr/bin/apt-add-repository", line 139, in <module>
    sys.stdin.readline()
KeyboardInterrupt
root@maas:~# grep -R maas/stable /etc/apt/
/etc/apt/sources.list.d/maas-stable-trusty.list.save:deb http://ppa.launchpad.net/maas/stable/ubuntu trusty main
/etc/apt/sources.list.d/maas-stable-trusty.list.save:# deb-src http://ppa.launchpad.net/maas/stable/ubuntu trusty main
/etc/apt/sources.list.d/maas-stable-trusty.list:deb http://ppa.launchpad.net/maas/stable/ubuntu trusty main
/etc/apt/sources.list.d/maas-stable-trusty.list:# deb-src http://ppa.launchpad.net/maas/stable/ubuntu trusty main
/etc/apt/sources.list.d/maas-stable-trusty.list:# deb-src http://ppa.launchpad.net/maas/stable/ubuntu trusty main

root@maas:~# aptitude install maas-image-builder
Couldn't find any package whose name or description matched "maas-image-builder"
Couldn't find any package whose name or description matched "maas-image-builder"
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

root@maas:~#