Well in fact it is just as said, the commands must be launched not from within Virtualbox but maybe I could have been helped by having a few words more in that step by step.
I was actually trying to locally test a revert of row number 176 in this helpful fix where it seemed that row 176 change was not necessary and I got a regression appear in Opera Presto around that very same moment: now internal links open in new tab.
So I was unlucky trying to instal a local Discourse because
- my professional PC on Windows 7 can build the image with Vagrant but VirtualBox cannot run VM in 64 bit mode or something like that which requires BIOS access or something.
- my own PC on Windows XP SP3 cannot run Vagrant (but it can run VirtualBox in 64 bit mode, albeit very slowly but NP).
Maybe I should try and generate image on pro PC and then run it on own PC but it is all scripted and I don’t know how much I can interfere in the middle of the process…