Upgrading from Linux Mint 17.2 “Rafaela” to Linux Mint 17.3 “Rosa”

ORIGIN : http://sourcedigit.com/17812-linux-mint-17-3-rosa-download-upgrade/

First of all, run the following commands to update the system to the current stable state:

$ sudo apt update
$ sudo apt upgrade
$ sudo reboot

After updating the system, we need to update the distribution code (change the name of the official repositories for Rosa packages). Run the following commands to do so:

$ sudo sed -i 's/rafaela/rosa/' /etc/apt/sources.list
$ sudo sed -i 's/rafaela/rosa/' /etc/apt/sources.list.d/official-package-repositories.list

Finally, run the commands to update the system files and the distribution package:

$ sudo apt update
$ sudo apt upgrade
$ sudo apt dist-upgrade

Once the system-update process is complete, restart the system – manually or use the command “sudo reboot” (without quotes).