Observe: Make a file under /and so forth/apt/resources.list.d, not the /and so on/apt/sources.listing file wherever the distribution's official repository addresses are located. That is a approach that will not destabilize your method. It is usually recommended. Whenever you produce a support circumstance for specific Virtual Machine (VM) difficulty kinds, https://www.hostscheap.com/interspire-email-marketer-install-service