Unable to update vagrant dev install on Windows

you need special rights to create symbolic links with windows (inside virtual machines), the right goes by “SeCreateSymbolicLink”.
Administrator have this right by default. When you run vagrant up/ssh, you need to run it with a user that has this right.

I avoided this error by starting a powershell as administrator (since I didn’t want to bother with granting rights to my user) and discourse is up and running