Proxy settings on WSL

/etc/environment

http_proxy=http://<proxy>:<port>
https_proxy=https://<proxy>:<port>

/etc/bash.bashrc

export http_proxy=http://<proxy>:<port>
export https_proxy=https://<proxy>:<port>

/etc/apt/apt.conf

Acquire::http::Proxy "http://<proxy>:<port>";
Acquire::https::Proxy "http://<proxy>:<port>";

/etc/wgetrc

http_proxy = http://<proxy>:<port>
https_proxy = http://<proxy>:<port>
ftp_proxy = http://<proxy>:<port>

anaconda3/envs/

proxy_servers:
    http: http://<proxy server>:<port>
    https: https://<proxy server>:<port>

次のコマンドで設定内容を確認

$ conda config --show