There is no package named 'xenial/proposed', however there is a repository called that name.
Note: enabling the repository xenial/proposed
is not really encuraged because it contains bleeding edge developtment packages which may even be able to break your setup
To easily enable all the repositories you can change your /etc/apt/sources.list
by:
sudo nano /etc/apt/sources.list
And the following section is a compressed enable all repositories sources.list
you can copy&paste or change your sources.list
to look alike:
# deb cdrom:[Ubuntu 16.04 LTS _Xenial Xerus_ - Release amd64 (20160420.1)]/ xenial main restricted
deb http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-backports main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-proposed main restricted universe multiverse
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner
After done this edit, simply do an sudo apt-get update
to cache the new enabled repositories, from there you can install whatever you need.
packagename/xenial-proposed
. The error is valid. – Severus Tux Jun 03 '16 at 19:10