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Fast and excludes words with apostrophes. For ubuntu, you can use wamerican or wbritish dictionaries, installable through aptitude.
The first grep rejects capitalised words since the dict has proper nouns in it that you mightn't want to use. The second grep rejects words with ending in apostrophe s, and the third forces the words to be at least 15 characters long.
This is what I came up to generate XKCD #936 style four-word password.
Since first letter of every word is capitalized it looks a bit more readable to my eyes.
Also strips single quotes.
And yes - regex is a bit of a kludge, but that's the bes i could think of.
Generates a password using symbols, alpha, and digits. No repeating chars.
Works in sort (GNU coreutils) 7.4, don't know when it was implemented but sometime the last 6 years.
shuf is in the coreutils package
Maybe not the quicker because of the sort command, but it will also look in other man sections.
updated with goodevilgenius 'shuf' idea