anaconda update all possible packages?
<p>I tried the <code>conda search --outdated</code>, there are lots of outdated packages, for example the scipy is 0.17.1 but the latest is 0.18.0. However, when I do the <code>conda update --all</code>. It will not update any packages.</p>

<p><strong>update 1</strong></p>

<pre><code>conda update --all --alt-hint

Fetching package metadata .......
Solving package specifications: ..........

# All requested packages already installed.
# packages in environment at /home/user/opt/anaconda2:
#
</code></pre>

<p><strong>update 2</strong></p>

<p>I can update those packages separately. I can do <code>conda update scipy</code>. But why I cannot update all of them in one go?</p>