Be sure to check out the upgrading advice for troubleshooting and warnings prior to your upgrade. #releasingstretch

Debian Project at 2017-06-18T10:48:05Z

Be sure to check out the upgrading advice for troubleshooting and warnings prior to your upgrade. https://www.debian.org/releases/stretch/amd64/release-notes/ch-upgrading.en.html #releasingstretch