title: postgres cannot create extension postgis
body: <p>i installed postgres on a new vps and then i installed postgis, but trying to create a postgis extension i always get this error:</p>
  
  <pre><code>    create extension postgis;
  ERROR:  could not load library "/usr/lib/postgresql/10/lib/rtpostgis-2.4.so": /usr/lib/x86_64-linux-gnu/libssl.so.1.1: version `OPENSSL_1_1_1' not found (required by /usr/lib/x86_64-linux-gnu/libmysqlclient.so.20)
  </code></pre>
  
  <p>i have no idea how to solve it.</p>
  
  <p>i also tried to install openssl and libssl-dev but didn't help</p>
  
  <p>edit:
  i am using 18.04.4 LTS ubuntu</p>
  
  <p>i install issuing: </p>
  
  <pre><code>sudo apt install postgresql postgresql-contrib
  sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable
  sudo apt-get update
  sudo apt-get install postgis
  </code></pre>