Take note: Produce a file under /and so on/apt/sources.checklist.d, not the /and so forth/apt/resources.listing file where the distribution's Formal repository addresses are located. That is a method that won't destabilize your system. It is usually recommended. It is as simple as that, there is no place complicating problems. As https://freshbookmarking.com/story17062066/5-simple-statements-about-magento-2-migration-explained