pesquisando o seu erro ssl retornou isso, eu tentaria essas soluções. link
talvez você tenha mexido com o seu SSL?
Estou tendo problemas para instalar o Rust no meu Ubuntu-gnome 16.04.2. Segui a instalação básica mencionada no site Rust . Eu estou anexando a saída de comando para leitura
$ curl https://sh.rustup.rs -sSf | sh
info: downloading installer
Welcome to Rust!
This will download and install the official compiler for the Rust programming
language, and its package manager, Cargo.
It will add the cargo, rustc, rustup and other commands to Cargo's bin
directory, located at:
/home/pearlstud/.cargo/bin
This path will then be added to your PATH environment variable by modifying the
profile file located at:
/home/pearlstud/.profile
You can uninstall at any time with rustup self uninstall and these changes will
be reverted.
Current installation options:
default host triple: x86_64-unknown-linux-gnu
default toolchain: stable
modify PATH variable: yes
1) Proceed with installation (default)
2) Customize installation
3) Cancel installation
1
info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
error: could not download file from 'https://static.rust-lang.org/dist/channel-rust-stable.toml.sha256' to '/home/pearlstud/.rustup/tmp/323e8vx3qfke7r7w_file'
info: caused by: error during download
info: caused by: [35] SSL connect error (error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol)