Question about printer repairing permissions
Fixing permissions simply means that macOS is going through it's files and ensuring that all the files have the correct ownership and permissions (to read/write/execute). 

For more detailed explanation on permissions, have a look at this article.

Usually, when something isn't working right, "fixing permissions" solves the problem because the system process that handles the operation (like printing) didn't have the permissions to access the necessary files.

In your case, it sounds like you have the wrong printer driver.