E: Unable to locate package mysql on Vagrant machine and how to install it

sudo apt-get update sudo apt-get install mysql-server

I``` have tried this but unable to install it. its shows an error saying: the following packages cannot be authenticated.

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Indeed as X40C suggested try running sudo apt-key update and sudo apt-get update and then run the sudo apt-get install mysql-server command.

Or another approach would be to use the MySQL APT Repository:

sudo dpkg -i mysql-apt-config_0.8.1-1_all.deb
sudo apt update
sudo apt install mysql-server 
sudo systemctl start mysql 

Regards, Bobby