On Mon, 23 Oct 2017, Arthur Tam wrote:
after I upgrade ubuntu to 16.04.3, I type "which curl" in shell and I found it is running /usr/local/bin/curl but not /usr/bin/curl
I think you're confusing matters. Ubuntu doesn't install things in /usr/local, those are custom installed by you. The curl version is not put there by the Ubuntu installer.
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