The designated data directory /home/test/mysql-8.0/data/ is unusable. You can remove all files that the server added to it.

If the designated data directory "/home/test/mysql-8.0/data/" is unusable, you can remove all the files that the server added to it. However, please note that removing these files will delete all the data stored in the MySQL database. Make sure to backup any important data before proceeding with the following steps:

1. Stop the MySQL server: Use the appropriate command to stop the MySQL server. For example, you can use `sudo service mysql stop` or `sudo systemctl stop mysql` depending on your system.

2. Remove the data directory: Execute the following command to remove the data directory and its contents:

sudo rm -rf /home/test/mysql-8.0/data/

Please be cautious when using the `rm` command with the `-rf` options, as it will recursively delete all files and directories without confirmation.

3. Recreate the data directory: After removing the data directory, you can recreate it using the following command:

sudo mkdir /home/test/mysql-8.0/data/

4. Set appropriate permissions: Ensure that the newly created data directory has the correct permissions for MySQL to access and modify it. You can set the necessary permissions using the following command:

sudo chown -R mysql:mysql /home/test/mysql-8.0/data/
sudo chmod -R 770 /home/test/mysql-8.0/data/

These commands will change the ownership of the directory to the MySQL user and grant appropriate read, write, and execute permissions.

5. Start the MySQL server: Start the MySQL server using the appropriate command. For example, you can use `sudo service mysql start` or `sudo systemctl start mysql`.

After completing these steps, the data directory should be recreated and ready for MySQL to use. However, keep in mind that all previous data will be lost.