@pavlos_kairis thank you very much for everything and now forget about this, I realized what was wrong and it was something I made.
Once the pc took more than a minute to shut down so I browsed some threads here at the forum and found a post telling how to shorten the off time; so I did and set it to 15 seconds. It was n. 4 in this thread.
Turns out that most probably each time I shut down the pc it was not enough time to complete the shutdown process, so naturally the emergency mode poops up. Already undone the process and was able to boot twice in a row normally, no emergency mode at all. It’s solved.
Adding to this just a question, if the pc takes too long to shutdown, which log should I check to see what is hanging the system?