How to upgrade fish on ubuntu
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sudo add-apt-repository ppa:fish-shell/release-3 sudo apt-get update sudo apt-get install fish
Gets fish 3.3.1 as of now. 
To build from source, see the bionic docker image.
Starting with 3.4, the following feature flags make ? and & work as you'd expect in urls :ↄ
./fish -f qmark-noglob,ampersand-nobg-in-token