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I read from multiple websites that it's possible to download Java 8 on a Chromebook without having to use crouton. I do already have crouton but for matters of convenience, I wanted to be able to use Java 8 without having to switch over to Ubuntu. So, I read that all you to do is access the Chrome terminal and type "shell", press enter. Type "sudo su", press enter. Then, type "mount -o remount,exec,rw /" and press enter. I can't seem to get past this step though. Here's what I get after typing all of that:

crosh> shell

chronos@localhost / $ sudo su

localhost / # mount -o remount,exec,rw /

mount: cannot remount /dev/dm-0 read-write, is write-protected

I've tried looking this up, but I'm a novice programmer and just started learning how to use Linux. Needless to say, I can't keep up with some of the other forum posts that have asked similar questions.

Any idea what I'm doing wrong?

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You have to disable write protection to access the hard-drive to modify. If you want to disable write protection, you are going to have to mess with the hardware. this might help (this is model-specific) https://gist.github.com/jcs/4bf59314d604538a5098

if you don't feel up to it, you can install ubuntu on the chromebook to switch OSes and install java on xfce4. I've personally installed this, and I say this will work pretty good just make sure you are in dev channel, and follow the instructions https://www.lifewire.com/install-linux-on-chromebook-4125253

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