This will generate discussions, I'm sure, but... Julio, why are you using "institution_url" for the root_web setting?
In 1.9.x, we store an institution_url which was previously a link that could be shown in the banner of the site. Now, you are supposing this is the root_web, but in 1.9.x, we used a param called $urlForm for that, not the institution (these are 2 different install form fields). I need to understand what was your intention to know if you were right or wrong. If the intention is to simplify, then ok, maybe (although not without discussion), but if the intention was to use a better name, then it's definitely wrong, as it overwrites another value that was stored in the database. The root_web itself is not stored in the database, but in the configuration file.