I have emacs 25.2.2 and installed through
M-x list-packages AUCTeX 12.1.1.
Opening any LaTeX file gives the native latex mode, so it seems through
LaTeX/P mode defined in ‘tex-mode.el’: :override advice: ‘TeX-latex-mode’
Based on that, and the following, I would the say the activation did not go well:
You can detect the successful activation of AUCTeX and preview-latex in the menus after loading a LaTeX file like 'preview/circ.tex': AUCTeX then gives you a 'Command' menu, and preview-latex gives you a 'Preview' menu.
What should I do?