Comments - Mariabackup Overview
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Try to update your repository first
sudo apt-get update
Is your server's hostname
DEV-MARIADB-015
? If this is the case then the problem could basically be lying in your /etc/hostname or /etc/hosts.Make sure your /etc/hostname file has your actual hostname. Then double check /etc/hosts and make sure an entry similar to this exists:
127.0.0.1 localhost localhost.localdomain DEV-MARIADB-015