cargo install du-dust Updating crates.io index error: failed to fetch `https://github.com/rust-lang/crates.io-index`

[monacv]

I got the following error trying to install dust in Ubuntu 18.04:

$ cargo install du-dust
    Updating crates.io index
error: failed to fetch `https://github.com/rust-lang/crates.io-index`

Caused by:
  failed to authenticate when downloading repository: ssh://git@github.com/rust-lang/crates.io-index

  * attempted ssh-agent authentication, but no usernames succeeded: `git`

  if the git CLI succeeds then `net.git-fetch-with-cli` may help here
  https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli

Caused by:
  error authenticating: no auth sock variable; class=Ssh (23)

I have:

$ cargo -V
cargo 1.46.0
$ lsb_release -a
LSB Version:	core-9.20170808ubuntu1-noarch:security-9.20170808ubuntu1-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.5 LTS
Release:	18.04
Codename:	bionic

[monacv]

You can ignore this since I was able to install it from the source.