This is how to upgrade today from Linux Mint 19 Tara, to the bèta of 19.1 Tessa:
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sudo sed -i 's/tara/tessa/g' /etc/apt/sources.list.d/official-package-repositories.list
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sudo apt-get update
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sudo apt-get dist-upgrade
Tested successfully on two of my test rigs.
Reason for posting: premature upgrade how-to's always pop up long before the official upgrade path is being made available. So I thought it might be a good idea to forestall them with a how-to that warns clearly about the risks.