rebar3 install plugins failed

Question

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:

===> 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 .

I can't get more useful information from google, rebar3 doc and existed question here.

So, I open a new question to ask Why and How to resolve it.

ps: I use proxychains for rebar3, it reports |DNS-response| repo.hex.pm is 151.101.54.2
inet_gethost[10708]: WARNING:Malformed reply (header) from worker process 10709. |DNS-response| repo.hex.pm is 151.101.54.2
inet_gethost[10708]: WARNING:Malformed reply (header) from worker process 10709.

Answer 1

就我而言，它是在设置代理环境变量（http_proxy）而不是使用proxychains时修复的。