Unable to Upgrade SaltStack
<p>I am trying to upgrade my saltstack master and minion on ubuntu following steps in blog
<a href="http://www.revsys.com/blog/2014/nov/16/upgrade-salt-master-and-minions-ubuntu-servers/" rel="nofollow noreferrer">http://www.revsys.com/blog/2014/nov/16/upgrade-salt-master-and-minions-ubuntu-servers/</a></p>

<p>But i get the following error
Step 1 : sudo salt ‘*’ cmd.run “aptitude update”
<a href="https://i.stack.imgur.com/vDFEP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vDFEP.png" alt="enter image description here"></a></p>

<p>Step 2 : Update Master
<a href="https://i.stack.imgur.com/UBjRh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UBjRh.png" alt="enter image description here"></a></p>

<p>Step 3 : Update Minion
<a href="https://i.stack.imgur.com/Q3jhg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q3jhg.png" alt="enter image description here"></a></p>

<p><strong>I want to upgrade to 2015.8.6</strong></p>

<p>I suspect something is not working in step 1.</p>

<p>Present Ubuntu version.</p>

<p><a href="https://i.stack.imgur.com/QHoL8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QHoL8.png" alt="enter image description here"></a></p>

<p><strong>Did the following ,</strong> 
*
1) on running fgrep -lR "saltstack" , it gives only master file</p>

<p>2) and i opened master file i could see saltstack only in comments. so didnt make any changes there</p>

<p>3) wget -O - <a href="https://repo.saltstack.com/apt/ubuntu/14.04/amd64/latest/SALTSTACK-GPG-KEY.pub" rel="nofollow noreferrer">https://repo.saltstack.com/apt/ubuntu/14.04/amd64/latest/SALTSTACK-GPG-KEY.pub</a> | sudo apt-key add -
--2016-04-15 17:58:34--  <a href="https://repo.saltstack.com/apt/ubuntu/14.04/amd64/latest/SALTSTACK-GPG-KEY.pub" rel="nofollow noreferrer">https://repo.saltstack.com/apt/ubuntu/14.04/amd64/latest/SALTSTACK-GPG-KEY.pub</a>
Resolving repo.saltstack.com (repo.saltstack.com)... nnn.nnn.nn.nnn, 2805:a770:450:a0::2:d001
Connecting to repo.saltstack.com (repo.saltstack.com)|nnn.nnn.nn.nnn|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1744 (1.7K)
Saving to: ‘STDOUT’
100%[==============================================================================================================================>] 1,744       --.-K/s   in 0s
2016-04-15 17:58:36 (14.1 MB/s) - written to stdout [1744/1744]
OK</p>

<p>4) on running 'sudo apt-get update' get error W: GPG error: <a href="https://packages.elastic.co" rel="nofollow noreferrer">https://packages.elastic.co</a> stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D38D777CD99E42A4*</p>