Error starting penguin container: 15 Launching vmshell failed: Error starting crostini for terminal: 15|| What to do?

So I tried to download steam but it went wrong so I tried to uninstall it. It then said that there was an error and that I should try uninstalling it through the terminal. I didn't know how to uninstall apps like that so I put 'sudo apt uninstall steam'. Then it said this 'sudo: you do not exist in the passwd database'. I thought t was because I had put it wrong so I tried the most basic command I knew, 'sudo apt update'. Once again, it said this 'sudo: you do not exist in the passwd database'. I don't know what to do. Then psomehow it started working again. But then the terminal wouldnt respond saying 'Error starting penguin container: 15 Launching vmshell failed: Error starting crostini for terminal: 15' I have o idea what to do.

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