LESS

Install the LESS CSS Preprocessor for Drupal

The Less CSS Preprocessor requires installing a LESS engine, but the instructions are confusing.

The LESS Engines documentation page is a little more helpful, except for a missing little twist... Here's how to do it:

Install node.js / npm / less on Ubuntu with Plesk

Note: If you need LESS just for Drupal, see Install the LESS CSS Preprocessor for Drupal.

Some posts, like Ubuntu installation directions for fresh web-server recommend something like

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