Chromebooks don't run a standard Linux. You'll need to visit specific forums for ChromeOS and using linux to get most help.
Of course, you could have taken extreme steps and wiped ChromeOS from the system, opened the case and broke the write-protection of the firmware, loaded new firmware that would allow non-ChromeOS operating systems to be installed, then installed some version of Ubuntu Desktop onto the device. If this is the situation, people here can help.
I've had a few Chromebooks over the years, but never had any with the newer run-linux-applications capability. I've used Crouton for a few months before being frustrated with the limitations (there are many) and doing what the paragraph above (write-protect, new firmware, load a real Linux OS) says. I was mostly happy with using a normal Linux distro on my chromebooks. The only real problem I experienced was the terrible keyboards missing about 5 keys and that the keyboards wear out too fast. Replacing a keyboard on a chromebook is like brain surgery.
As for the other things, ~/Downloads is just a directory. If it isn't there, MAKE IT! If you need some file that doesn't exist, MAKE IT. Also, don't forget that Linux is case-sensitive, so
Code:
~/Downloads
~/downloads
~/DownloadS
are all different.
I know nothing about python beyond the big picture stuff that knowing many other scripting languages has provided.
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