[nolist_policy]

Um, you literally go to Settings -> About ChromeOS -> Developers, enable "Linux development environment" and after 5 minutes have access to fully featured Debian Linux.

The standalone (non-linux) ssh client is indeed not the best, it's okay.

[hot_gril]

We aren't allowed to do the first suggestion at work. If you can, and it's literally Debian, then it's fine.