unmet dependencies issue while mariadb-server on Ubuntu 18.04(SOLVED).

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To solve the unmet dependencies follow the instruction below:
1. Add the MariaDB GPG key to your system. Run the commend below:sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8

 Note: For Ubuntu 18.04  install software-properties-common package to get add-apt-repository command.

 2. Add the MariaDB repository with the following command:sudo add-apt-repository 'deb [arch=amd64,arm64,ppc64el] http://ftp.utexas.edu/mariadb/repo/10.3/ubuntu bionic main'
3. Update the packages list: sudo apt update
4.  Now install the MariaDB package: sudo apt install mariadb-server


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