Thanks for all the links. I’m going to go over those taking my time.
Also, thanks to @kisman172 reassuring me about having the recovery mode available, after that, I went on and did the update and it works.
(actually, I’m already exploring your links) I think this was the page I didn’t find but which I was probably looking for: [HOWTO] Update /e/
Please note: The day is not ruined at all.
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