An invalid slug error means that the parameter following check50 or submit50 is incorrect. Go back to the problem spec and see what it's supposed to look like. I'll guess a missing slash or something.
If this answers your question, please click on the check mark to accept. Let's keep up on forum maintenance. ;-)
You're correct that the submission process changed in late July.
All of your old submissions can be seen here: http://legacy.cs50.me and new submissions here: http://submit.cs50.io
Both groups of submissions are used for grading, so you should see the progress here: http://cs50.me/cs50w
Are you using your actual GitHub password or your access token's code? If you have enabled two-factor authentication with GitHub and you haven't created an access token, you will need to create one for CS50 as GitHub no longer allows submit50 to connect using your regular sign-in credentials.
You can follow this link to learn how to do this:
Creating a ...
In the course IDE there are several useful tools pre-installed for students, as you probably already know, therefore it is more than recommended to use CS50 IDE, but if you still want to use your Linux subsystem, I think it is possible to install these tools. I hope you can handle Linux well, here is a link where you can find more information:
I noticed this a duplicate question that you have already posted here but I can't flag it as a duplicate, so I'll repost my answer here in case anyone chances upon this one instead:
This is due to the new automatic GitHub authentication introduced in VSCode version 1.45.
The temporary fix for this is to disable Git: GitHub Authentication in your VSCode ...
You've hard-coded the 8 into your loop regardless of the actual height requested.
Also, once you submit, you can go to your submit.cs50.io page and, on your submission, click the check50 and style50 buttons to see the tests that were run.
The new submission system went into effect a couple of days ago (July 29, 2019).
You can submit your final project directly on github. You are only required to submit a README.md file describing your project, so the easiest is to do that directly on github.com
First, go to http://cs50.me/cs50x and make sure you are set up for the CS50x course in the new ...
Given that check50 and submit50 are installed on the host machine, the CLI tools can be accessed via CLion Embedded Local Terminal.
The official documentation for cli50 and submit50 shall aid you with the installation.