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Upgrading Ubuntu chroot environment?

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linux-howto

http://askubuntu.com – What is the proper way to upgrade Ubuntu chroot environment to a newer Ubuntu release? The chroot environment has been originally set up using debootstrap. The proper way to upgrade a Ubuntu server is to use do-release-upgrade command. Ubuntu is based on Debian. Debian can be upgraded by replacing the release name in /etc/apt/sources.list with the new release name and running apt-get update, apt-get upgrade and apt-get dist-upgrade. Which one is the proper way to upgrade a Ubuntu chroot environment? What does do-release-upgrade do differently from the Debian way? (HowTos)