I'm not sure specifically what the 'apt 407 real story' is without more context. It could be a story related to apartment 407, perhaps something that happened there like a mystery, a personal experience of the tenant, or an event in the building where the apartment is located.
One possible scenario could be that it's a story of a family that moved into apt 407 and found it haunted. They might have experienced strange noises, objects moving on their own, etc.
I'm not sure specifically what the 'apt 407 true story' is without more context. It could be a story related to an apartment numbered 407, perhaps something that happened there like a mystery, a personal experience, or an event in the building.
Corrupted repositories can be a cause. If the sources.list file (which lists the repositories from where apt fetches packages) is incorrect or if the repositories themselves are corrupted. This can happen due to network issues during an update or if the repository server has some problems. When apt tries to access these bad repositories, it can lead to all sorts of errors and horror - like situations. Another cause could be disk errors. If there are problems with the disk where the apt cache or the package files are stored, it can result in data corruption and apt failures.
A novel is considered apt when it has a compelling plot that keeps the readers engaged. Good character development and a unique writing style also contribute to its aptness.