"Turn it off and on again" or "Uninstall and reinstall" worked.
Sounds like something went wrong bootstrapping steam (truncated download?). An alternative would have been to run steam --reset in a terminal.
In any case, glad to hear you got it working. Closing.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
So, I installed steam and it went just fine. Up until I needed to properly start it. Running it from the terminal I get this: Terminal
Steps for reproducing this issue: