Where did my Emacs color-theme go in Ubuntu 20.04.LTS?!

Having recently upgraded a small VPS from Ubuntu 18.04.LTS to Ubuntu 20.04.LTS, I ran into a little snag with Emacs and its color-theme (from the emacs-goodies-el package). After some digging, it seems this is now done somewhat differently in Ubuntu 20.04.LTS. This is what my .emacs file used to contain: …

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