wget is not going to help - it's very different. You have to use apt-get (or in recent versions, apt update works the same).
But mainly, the screenshot shows something horrible happening - all the error messages above. I've never seen a chromebook so I don't know crouton, but I think something went wrong enough for the Linux desktop to have shut down. I'm not sure if you still have linux running there, or whether it has stopped completely and left you in crouton. The line near the bottom of the error messages about unmounting suggests to me that linux is no longer running at all. I'm sorry, I can't help you with that - hopefully someone else can. But your problem is with the install and crouton, not with apt-get.
If you ever get to step 8 wihtout a crash, the instructions on step 8 are wrong. They should be three separate commands.
Code:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install
but the third command needs to know what to install, e.g. sudo apt-get install mahjongg. For now, if you ever get this far, I suggest you ignore the third command, and just do an update and an upgrade once the basic installation is working.
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