Why am i writing this?While Debian is a great distro, upgrading between major versions is a bit of a pain. There’s no real automatic way to do it, and some guides contradict each other a bit. This is how I did it (for one VM) and how I will do it for the rest of them. Probably. What I started with: Note: How it’s done: To get the system up-to-date (and in a state to actually upgrade), run: Reboot. Now check the current version with It should say 12.13 or above. If it doesn’t, please get your system up-to-date. Now let’s check for old or conflicting packages, which can be removed: And remove them. apt does this quite well: Next, we’ll check for held and non-standard packages. A package held at an old version might prevent the upgrade. Non-standard packages can come from sources, which don’t have a new repo.