npm is installed but running "sudo apt-get install npm" gives error. Why?
<p>When i run <code>npm -v</code> it shows version as <code>3.8.9</code> but if i run <code>sudo apt-get install npm</code> on command line, i get following errors:</p>

<pre><code>Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 npm : Depends: nodejs but it is not going to be installed
       Depends: node-abbrev (&gt;= 1.0.4) but it is not going to be installed
       Depends: node-ansi (&gt;= 0.3.0-2) but it is not going to be installed
       Depends: node-ansi-color-table but it is not going to be installed
       Depends: node-archy but it is not going to be installed
       Depends: node-block-stream but it is not going to be installed
       Depends: node-fstream (&gt;= 0.1.22) but it is not going to be installed
       Depends: node-fstream-ignore but it is not going to be installed
       Depends: node-github-url-from-git but it is not going to be installed
       Depends: node-glob (&gt;= 3.1.21) but it is not going to be installed
       Depends: node-graceful-fs (&gt;= 2.0.0) but it is not going to be installed
       Depends: node-inherits but it is not going to be installed
       Depends: node-ini (&gt;= 1.1.0) but it is not going to be installed
       Depends: node-lockfile but it is not going to be installed
       Depends: node-lru-cache (&gt;= 2.3.0) but it is not going to be installed
       Depends: node-minimatch (&gt;= 0.2.11) but it is not going to be installed
       Depends: node-mkdirp (&gt;= 0.3.3) but it is not going to be installed
       Depends: node-gyp (&gt;= 0.10.9) but it is not going to be installed
       Depends: node-nopt (&gt;= 3.0.1) but it is not going to be installed
       Depends: node-npmlog but it is not going to be installed
       Depends: node-once but it is not going to be installed
       Depends: node-osenv but it is not going to be installed
       Depends: node-read but it is not going to be installed
       Depends: node-read-package-json (&gt;= 1.1.0) but it is not going to be installed
       Depends: node-request (&gt;= 2.25.0) but it is not going to be installed
       Depends: node-retry but it is not going to be installed
       Depends: node-rimraf (&gt;= 2.2.2) but it is not going to be installed
       Depends: node-semver (&gt;= 2.1.0) but it is not going to be installed
       Depends: node-sha but it is not going to be installed
       Depends: node-slide but it is not going to be installed
       Depends: node-tar (&gt;= 0.1.18) but it is not going to be installed
       Depends: node-underscore but it is not going to be installed
       Depends: node-which but it is not going to be installed
</code></pre>

<p>I don't understand why this is happening. Is the npm correctly installed or if it is not, then what should i do?</p>