I tried installing Metasploitable2 so I can use it to practice hacking, but when I boot up, I get an exit status of `4` from `fsck`, meaning there were filesystem errors that `fsck` didn't correct. I wonder if this is due to one of the vulnerabilities in the system - like there's a certain exploit that involves taking advantage of a bad block, and `fsck` is interpreting that as an error. In any case, now I need to look up the root password so I can get into the maintenance shell, and then run `fsck` with the `-y` option to force it to repair the errors. Hopefully that will work.