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1) Jessie is not "unstable" any more. It is the [most up-to-date stable Debian distribution][1]. From the 25 Apr announcement: > the Debian project is proud to present its new stable version 8 (code > name Jessie), which will be supported for the...
When I upgraded my new Raspberry Pi 2 (the one with the 4-core ARM v7 CPU) from Raspbian "Wheezy" ( = Debian 7) to Raspbian "Jessie" ( = Debian 8), Mathematica and the Wolfram Engine packages were gone. I asked Wolfram Support (we have Premium...