title: postgresql-client-13 : Depends: libpq5 (>= 13~beta2) but 12.3-1.pgdg18.04+1 is to be installed
body: <p>I want to try new PostgreSQL and follow <a href="https://www.postgresql.org/download/linux/debian/" rel="noreferrer">this</a> instruction. But installation fails:</p>
  <pre><code>$ sudo apt install postgresql-client-13
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   postgresql-client-13 : Depends: libpq5 (&gt;= 13~beta2) but 12.3-1.pgdg18.04+1 is to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  <p>I also tried <a href="https://askubuntu.com/questions/140246/how-do-i-resolve-unmet-dependencies-after-adding-a-ppa">this</a> instruction to resolve <code>unmet</code> dependencies</p>
  <p>What did I wrong and how to install <code>psql</code> 13?</p>
  <p><strong>UPD</strong><br />
  Content of my <code>sources.list.d</code>:</p>
  <pre><code>kes@kes-X751SA /etc/apt/sources.list.d $ cat pgdg.list 
  deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg main
  
  kes@kes-X751SA /etc/apt/sources.list.d $ cat pgdg-testing.list 
  deb http://apt.postgresql.org/pub/repos/apt/ bionic-pgdg-testing main 13
  </code></pre>
  <p>Also:</p>
  <pre><code>$ sudo apt-cache policy postgresql-13
  postgresql-13:
    Installed: (none)
    Candidate: 13~beta2-1.pgdg18.04+1
    Version table:
       13~beta2-1.pgdg18.04+1 100
          100 http://apt.postgresql.org/pub/repos/apt bionic-pgdg-testing/13 amd64 Packages
  </code></pre>