Debian - ERROR: The certificate of 'git.io' is not trusted.

ERROR: The certificate of 'git.io' is not trusted.

Ошибка на Debian/Ubuntu вида:

ERROR: The certificate of 'git.io' is not trusted.
ERROR: The certificate of 'git.io' hasn't got a known issuer.

Решение - доустановить пакет ca-certificates:

# apt-get install ca-certificates