i am trying to use the proposed repo of vivid on ubuntu 15.04 server system.
user@controller:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.04
DISTRIB_CODENAME=vivid
DISTRIB_DESCRIPTION="Ubuntu 15.04"
i added the below line to /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu vivid-proposed multiverse main restricted universe
when i try to use aptitude -t vivid-proposed i am greeted with below error:
E: The value 'vivid-proposed' is invalid for APT:: Default-Release as such a release is not available in the sources.
i am following the steps detailed at https://wiki.ubuntu.com/Testing/EnableProposed
am i missing something?