title: sudo apt-get update failing in ubuntu 12.04
body: <p>I am trying to update apt-get in order to install salt-minion but I am getting the error <strong>GPG error: <a href="http://repo.saltstack.com" rel="nofollow">http://repo.saltstack.com</a> precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E08A149DE57BFBE</strong> so I am not able to update and then install what I need</p>
  
  <pre><code>root@PrestezaAlpha:/etc/apt/sources.list.d# sudo apt-get update
  Get:1 http://security.ubuntu.com precise-security Release.gpg [198 B]
  Get:2 http://repo.saltstack.com precise Release.gpg [490 B]                    
  Get:3 http://security.ubuntu.com precise-security Release [55.5 kB]            
  Hit http://repo.saltstack.com precise Release                                  
  Ign http://repo.saltstack.com precise Release                                  
  Ign http://repo.saltstack.com precise/main i386 Packages/DiffIndex             
  Ign http://repo.saltstack.com precise/main TranslationIndex                    
  Hit http://apt.newrelic.com newrelic Release.gpg                               
  Get:4 http://security.ubuntu.com precise-security/main i386 Packages [658 kB]  
  Hit http://apt.newrelic.com newrelic Release                                   
  Hit http://repo.saltstack.com precise/main i386 Packages                       
  Ign http://repo.saltstack.com precise/main Translation-en                      
  Hit http://apt.newrelic.com newrelic/non-free i386 Packages                    
  Ign http://apt.newrelic.com newrelic/non-free TranslationIndex                 
  Get:5 http://security.ubuntu.com precise-security/main TranslationIndex [208 B]
  Get:6 http://security.ubuntu.com precise-security/main Translation-en [252 kB] 
  Hit http://archive.ubuntu.com precise Release.gpg                              
  Get:7 http://archive.ubuntu.com precise-updates Release.gpg [198 B]            
  Ign http://apt.newrelic.com newrelic/non-free Translation-en                   
  Hit http://archive.ubuntu.com precise Release                                  
  Get:8 http://archive.ubuntu.com precise-updates Release [55.4 kB]       
  Hit http://archive.ubuntu.com precise/main i386 Packages  
  Hit http://archive.ubuntu.com precise/universe i386 Packages
  Hit http://archive.ubuntu.com precise/main TranslationIndex
  Hit http://archive.ubuntu.com precise/universe TranslationIndex
  Get:9 http://archive.ubuntu.com precise-updates/main i386 Packages [1046 kB]
  Get:10 http://archive.ubuntu.com precise-updates/universe i386 Packages [284 kB]
  Hit http://archive.ubuntu.com precise-updates/main TranslationIndex            
  Hit http://archive.ubuntu.com precise-updates/universe TranslationIndex
  Hit http://archive.ubuntu.com precise/main Translation-en
  Hit http://archive.ubuntu.com precise/universe Translation-en
  Hit http://archive.ubuntu.com precise-updates/main Translation-en         
  Hit http://archive.ubuntu.com precise-updates/universe Translation-en     
  Fetched 2351 kB in 5s (416 kB/s)                                          
  Reading package lists... Done
  **W: GPG error: http://repo.saltstack.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E08A149DE57BFBE**
  </code></pre>
  
  <p>Sources list content:</p>
  
  <pre><code>deb  http://archive.ubuntu.com/ubuntu precise main
  deb  http://archive.ubuntu.com/ubuntu precise-updates main
  deb  http://security.ubuntu.com/ubuntu precise-security main
  deb  http://archive.ubuntu.com/ubuntu precise universe
  deb  http://archive.ubuntu.com/ubuntu precise-updates universe
  </code></pre>
  
  <p>/etc/apt/sources.list.d/saltstack.list:</p>
  
  <pre><code>deb http://repo.saltstack.com/apt/ubuntu/12.04/amd64/latest precise main
  </code></pre>
  
  <p>Do you have any idea how can I fix this?</p>
  
  <p>Thanks</p>