Wow did I miss this trying 16.04 Alpha but turns out to be an easy fix. Ctrl+F is sooo limited!
sudo apt-get install apt-xapian-index
sudo update-apt-xapian-index
Viola!
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Yep. Quick Filter all the way! 
One thing to consider that it may result in an overweight /var/cache/apt-xapian-index folder. (139 MB?!)
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I see 56MB on just the one pass BUT my Ubuntu-Mate 14.04 is up to 155MB but has a few added repos. It also sets up a cron.weekly update.
(I changed to a more suitable category - hope something doesn’t break. )
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xapian cause some serious performance issues on lower power hardware, which is why it doesn’t ship by default in Ubuntu MATE
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Hi Wimpy and thanks for a perfectly rounded topic. How to, why and why not - all covered. 
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