Afterwards I realized the file official-package-repositories.list has been changed with repositories which look like those from LMDE 1.
For the upgrade the file was changed as specified:
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deb http://packages.linuxmint.com betsy main upstream import
deb http://http.debian.net/debian jessie main contrib non-free
deb http://http.debian.net/debian jessie-updates main contrib non-free
deb http://security.debian.org jessie/updates main contrib non-free
deb http://www.deb-multimedia.org jessie main non-free
deb http://extra.linuxmint.com betsy main
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deb http://packages.linuxmint.com debian main upstream import
deb http://debian.linuxmint.com/latest/ testing main contrib non-free
deb http://debian.linuxmint.com/latest/security testing/updates main contrib non-free
deb http://debian.linuxmint.com/latest/multimedia testing main non-free
deb http://extra.linuxmint.com debian main
One difference I noticed on the Software Sources window between a upgraded system and a new installed system is in the addition between brackets after 'Main' and 'Base'. In the updated system I see:
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Main (debian)
Base (testing)
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Main (betsy)
Base (jessie)
How to resolves this? What file(s) to update.