For reference, the Chromebook model is SNOW FREMONT A-E 0878
I used Crouton to install Ubuntu on my Chromebook. In doing so, I had my computer in developer mode and wasn't able to save anything that was on my computer prior to doing so. As a result, I switched back to Chrome OS with the command Ctrl+Alt+Forward/Back to try and download a python script I was interested in playing around with from my class. I signed into my Google account, and from then on I haven't been able to access Ubuntu.
I tried putting the computer in recovery mode again and going through the steps once more (albeit I see it as a wasted effort since it's already ON my computer, but I digress).
Since trying to put it in recovery mode, I'm left with the yellow exclamation mark saying Chrome OS is missing or damaged; I put in the USB I used originally when going through the entire process. Another screen shows up that says the device I inserted does not contain Chrome OS (no duh). Ctrl+D is the next attempt, but to no prevail as I'm stuck with the yellow exclamation mark.