Craft backup "mysqldump: not found..." I'm getting an error message when trying to back up the Craft DB. 

2019-09-04 10:21:09 [-][1][6eba342acf082a62ea47300d68faddf4][error][yii\base\Exception] yii\base\Exception: Could not create backup: The shell command "mysqldump --defaults-extra-file="/var/www/html/storage/runtime/temp/my.cnf" --add-drop-table --comments --create-options --dump-date --no-autocommit --routines --set-charset --triggers --single-transaction --no-data --result-file="/var/www/html/storage/backups/client-name_190904_172109_fnrhjpwxac_v3.2.10.sql" craft &amp;&amp; mysqldump --defaults-extra-file="/var/www/html/storage/runtime/temp/my.cnf" --add-drop-table --comments --create-options --dump-date --no-autocommit --routines --set-charset --triggers --no-create-info --ignore-table=craft.assetindexdata --ignore-table=craft.assettransformindex --ignore-table=craft.sessions --ignore-table=craft.templatecaches --ignore-table=craft.templatecachequeries --ignore-table=craft.templatecacheelements --ignore-table=craft.cache --ignore-table=craft.templatecachecriteria craft &gt;&gt; "/var/www/html/storage/backups/client-name_190904_172109_fnrhjpwxac_v3.2.10.sql"" failed with exit code 127: sh: 1: mysqldump: not found in /var/www/html/vendor/craftcms/cms/src/controllers/UtilitiesController.php:343


I'm not sure where to look to solve this. How may I get the DB to back up?
Your server seems to be missing the shell command mysqldump, contact your IT-Specialist and tell him you need that to be installed you can backup your website.

Or if you plan on installing it yourself, this should do the trick.

Excerpt  from there:

sudo apt-get install mysql-client-5.7


If it's not able to find the package, try entering the statement till the mysql part and then hold tab it should then show you all available versions which you can install.