We really recommend using the Ghost CLI tool as it makes issues like this a lot less hassle. If you’ve only just set up this installation can you not start from a fresh using the Ghost CLI?
There is already content in the site (post, images, route, personal theme, etc…) so if it possible I don’t want to restart from scratch.
Can I do a “npm install -g ghost-cli@latest” in a ssh console of the “Cloud Web hosting” of OVH and after linking the content? Should something like ghost start --dir /path/to/site/ will work?