The new Linux Mint 17.3 “ROSA” is ready to use. Upgrading is relatively easy.
In the Update Manager, click on the Refresh button to check for any new version of mintupdate and mint-upgrade-info.
If there are updates for these packages, apply them.

1.) Launch the System Upgrade by clicking on “Edit->Upgrade to Linux Mint 17.3 Rosa”.

2.) Follow the instructions on the screen.

3.) Once the upgrade is finished, reboot your computer.

4.) Update the Kernel..

5.) Update the Grub : with the following command: “sudo update-grub”.

More infos at:
http://blog.linuxmint.com/?p=2955
https://mintguide.org/system/548-official-update-linux-mint-from-17-2-to-17-3-rosa.html

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