Android Studio AVD Manager cannot update system images
<p>When I open my AVD Manager from Android Studio (version 2.1 Preview 1), I am presented with a banner on my AVD list which reads:</p>

<p><code>System image update is available       (link:)"Update System Images"</code></p>

<p>When I click on the "Update System Images" link, I am presented with the following mysterious error message:</p>

<pre><code>**Packages Unavailable**

 The following packages are not available:
    - Package id system-images;android-MNC;default;x86_64
    - Package id system-images;android-MNC;default;x86
</code></pre>

<p>I don't know what this means or how to resolve it. Web searches have been fruitless. Any ideas?</p>

<p>Here is what I am seeing:
<a href="https://i.stack.imgur.com/MNsyY.png"><img src="https://i.stack.imgur.com/MNsyY.png" alt="enter image description here"></a></p>

<p>In response to Zayin, here is what I see when I look for the MNC system images. There doesn't appear to even be an option for installing them.
<a href="https://i.stack.imgur.com/Y5kqR.png"><img src="https://i.stack.imgur.com/Y5kqR.png" alt="enter image description here"></a></p>