title: Rabbitmq server failed to boot
body: <p>I'm trying to start my rabbitmq server using command:<code>sudo rabbitmq-server</code> on ubuntu 20.04 but it crashes.<br/>I have absolutely no clue whatsoever as to what I should do.<br/>
  Rabbitmq version: <strong>3.8.5</strong> erlang version: <strong>23</strong></p>
  <pre><code>17:41:07.587 [error] 
  
  17:41:07.591 [error] BOOT FAILED
  BOOT FAILED
  17:41:07.592 [error] ===========
  ===========
  17:41:07.592 [error] ERROR: distribution port 25672 in use by rabbit@nadaanbaalak
  ERROR: distribution port 25672 in use by rabbit@nadaanbaalak
  17:41:07.592 [error] 
  
  17:41:08.594 [error] Supervisor rabbit_prelaunch_sup had child prelaunch started with rabbit_prelaunch:run_prelaunch_first_phase() at undefined exit with reason {dist_port_already_used,25672,&quot;rabbit&quot;,&quot;nadaanbaalak&quot;} in context start_error
  17:41:08.594 [error] CRASH REPORT Process &lt;0.153.0&gt; with 0 neighbours exited with reason: {{shutdown,{failed_to_start_child,prelaunch,{dist_port_already_used,25672,&quot;rabbit&quot;,&quot;nadaanbaalak&quot;}}},{rabbit_prelaunch_app,start,[normal,[]]}} in application_master:init/4 line 138
  {&quot;Kernel pid terminated&quot;,application_controller,&quot;{application_start_failure,rabbitmq_prelaunch,{{shutdown,{failed_to_start_child,prelaunch,{dist_port_already_used,25672,\&quot;rabbit\&quot;,\&quot;nadaanbaalak\&quot;}}},{rabbit_prelaunch_app,start,[normal,[]]}}}&quot;}
  Kernel pid terminated (application_controller) ({application_start_failure,rabbitmq_prelaunch,{{shutdown,{failed_to_start_child,prelaunch,{dist_port_already_used,25672,&quot;rabbit&quot;,&quot;nadaanbaalak&quot;}}},{rabb
  
  Crash dump is being written to: erl_crash.dump...done 
  </code></pre>
  <p>Any help would be great</p>