rebar3 install plugins failed
rebar3 install plugins failed Env: rebar 3.6.0 on Erlang/OTP 21 Erts 10.0 Ubuntu 16.04 When I try to install the rebar3 pulgins (such as rebar3_hex), it reports: rebar 3.6.0 on Erlang/OTP 21 Erts 10.0 Ubuntu 16.04 ===> Package <<"rebar3_hex">> not found. Fetching registry updates and trying again... ===> Updating package registry... ===> Plugin rebar3_hex not available. It will not be used. ===> Package <<"rebar3_hex">> not found. Fetching registry updates and trying again... ===> Updating package registry... ===> Plugin rebar3_hex not available. It will not be used. There is only one line in my ~/.config/rebar3/rebar.config : {plugins, [rebar3_hex]}. as recommended in https://www.rebar3.org/docs/using-available-plugins#hex-package-management and https://github.com/tsloughter/rebar3_hex. ~/.config/rebar3/rebar.config {plugins, [rebar3_hex]}. I can't get more useful information from google, rebar3 doc and existed questio...