title: MonetDB error when starting mclient, cannot set locale
body: <p>I installed MonetDB on a Ubuntu 16.04 using the instructions: <a href="https://www.monetdb.org/easy-setup/ubuntu-debian/" rel="nofollow noreferrer">https://www.monetdb.org/easy-setup/ubuntu-debian/</a></p>
  <p>When trying to start the client: <code>mclient -u monetdb -d testdb</code></p>
  <p>I get back this error:</p>
  <blockquote>
  <p>monetdbd: internal error while starting mserver 'database 'testdb' appears to shut itself down after starting, check monetdbd's logfile (merovingian.log) for possible hints'</p>
  </blockquote>
  <p>and when I look inside the logfile I see that the problem is apparently related to the locale:</p>
  <blockquote>
  <p>&quot;2022-01-19 17:47:18 ERR testdb[15411]: cannot set locale&quot;</p>
  </blockquote>
  <p>Any hints?</p>