Ubuntu unable to locate package

I have installed devstack for openstack on ubuntu system. I am trying to install quantum-lbaas-agent. I get the error Unable to locate package. I tried changing the the sources list in the /etc/apt/sources.list file. I was unable to edit it and hence I changed permissions to 777 for sources.list. I ran sudo apt-get update after changing the permission. I still get the unable to locate package error. I tried running sudo apt-get upgrade as well. Still there was no progress.

Here is the output of sudo apt-get install quantum-lbaas-agent:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package quantum-lbaas-agent

here is my sources.list in the /etc/apt folder:

# deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release i386 (20130213)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://in.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ precise main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://in.archive.ubuntu.com/ubuntu/ precise universe
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://in.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://in.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://in.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http:extras.ubuntu.com/ubuntu precise main
deb-src http://extras.ubuntu.com/ubuntu precise main

Can someone help please. I am really stuck at this point. I have looked up various posts on ubuntu forums, etc.

Thanks in advance.

回答1:

The package cannot be found, because it is not in any of the archives listed in your sources.list file.

This page explains what you need to do:

http://docs.openstack.org/trunk/openstack-network/admin/content/install_ubuntu.html

I modified the steps a bit for your case to be perfectly clear and as easy as possible:

sudo su -
echo deb http://ubuntu-cloud.archive.canonical.com/ubuntu precise-updates/grizzly main >>/etc/apt/sources.list
apt-get install ubuntu-cloud-keyring 
apt-get update
apt-get install quantum-lbaas-agent

回答2:

This will work for virtualenv pip wheel errorcode1 problems and also E unable to locate package problems

    sudo apt-get update

    sudo apt-get install python-software-properties

    sudo apt-get install apt-file

    sudo apt-file update

    sudo apt-get install software-properties-common

    sudo apt-get install <your filename>

回答3:

You can do :

sudo apt-get purge

This will clean up the configs which may be stopping you form installing the package

回答4:

My problem

kuma-soft@kumasoft-Inspiron-15-3567:~$ sudo apt install virtualenv
[sudo] password for kuma-soft: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package virtualenv
kuma-soft@kumasoft-Inspiron-15-3567:~$ sudo apt install simplescreenrecorder
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package simplescreenrecorder