Conflict between hyperref and etoolbox packages

Question

I'm trying to compile a file using hyperref to get hyperlinks and etoolbox, for I want a specific setup for theorems that I actually found here (https://tex.stackexchange.com/a/424034/248426). However, just the mere mention of etoolbox makes my LaTeX crash!

Here's a MWE with error and the log file.

\documentclass{article}
\usepackage{hyperref}
\usepackage{etoolbox}
\begin{document}
If you can read this, then it works.
\end{document}

This is what I get on terminal (I compile from gedit directly into bash), using Ubuntu xenial and texlive from the Debian repositories (if that's somehow helpful).

! Undefined control sequence.
\AfterEndDocument ->\AddToHook 
                               {enddocument/end}
l.6 \begin{document}

I have literally no idea how to fix this or why this happens. I'd really like to keep both etoolbox and hyperref since when using one without the other, I get exactly what I want (provided of course, getting no features of the missing package).

Thanks for reading me!

EDIT

The LOG file: https://drive.google.com/file/d/1B64UwilPqReEByvE51H_tX4tj3N21qQC/view?usp=drivesdk

Welcome to TeX.SE! Can you please show the compplete log file for your given MWE? — Mensch, Oct 26 '21 at 19:44
\AddToHook is defined in the latex format in current releases so somehow you have got a new etoolbox or hyperref with an old latex. How did you update? — David Carlisle, Oct 26 '21 at 19:47
With an current MiKTeX I can compile without errors or warnings ... — Mensch, Oct 26 '21 at 19:49
@Mensch yes you'd need an old latex to have \AddToHook not defined. — David Carlisle, Oct 26 '21 at 19:50
but an old latex would have come with compatible etoolbox and hyperref that did not use commands added years later. — David Carlisle, Oct 26 '21 at 19:52
Ok I added some packages via direct download in CTAN. Moved the files into the base folder and then used the terminal. Maybe I did that with hyperref or etoolbox. Is there a way to check package versions? — Jesús Isea, Oct 26 '21 at 19:57
it's a bad idea to copy files into the standard directories, you will have over written the versions that came with the latex you are using. You are using a 2020 etoolbox with a 2015 latex, that is not going to work — David Carlisle, Oct 26 '21 at 20:05

Conflict between hyperref and etoolbox packages

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