Yes; did it! I finally worked my ways back into Google+ and Google Calendar.
Sadly, the Date/Time extension of GNOME 3 doesn’t support any calendar application other than Evolution, by default.
The more delighted I was when I found this great little Python script: GNOME Shell Google Calendar.
I’m not going to write a new installation guide, as there is already a very good one over at webupd8.org
But!
Just as I was, it seems like many Debian/Ubuntu users are experiencing this:
GNOME Shell Google Calendar ‘Startup Applications’ entry doesn’t work.
Let’s see what the programs output has to say: (more…)