[PD] having both vanilla and extended installed in linux (ubuntu)

[Matteo Sisti Sette]

Hi,

Not much time ago I asked a similar question about windows (this was 
straight-forward in windows in older version but then became a bit 
tricky)... Anyway, I now need the same (or a similar workaround) in Ubuntu:

How can I have both Vanilla and Extended installed, run one or the other 
depending on the need of the moment?

Thanks
m.