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chore: add an FAQ

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# FAQ
**Why is flatpak included? Should I use flatpak?**
https://github.com/secureblue/secureblue/issues/125#issuecomment-1859610560
**My fans are really loud, is this normal?**
During rpm-ostree operations, it's normal. Outside of that:
- Make sure you followed the nvidia steps in the readme if you're using nvidia.
- Make sure you're using a `laptop` image if you're using a laptop.
- Make sure you're using an `asus` image if you're using asus.
**Should I use firejail?**
[No](https://madaidans-insecurities.github.io/linux.html#firejail), use `bubblejail`` if there's no flatpak available for an app.
**An app I use won't start due to a malloc issue. How do I fix it?**
Override `LD_PRELOAD` for that app. For flatpaks, this is as simple as removing the environment variable via Flatseal.
**On secureblue half of my CPU cores are gone. Why is this?**
`mitigations=auto,nosmt` is set on secureblue. This means that if your CPU is vulnerable to attacks that utilize [Simultaneous Multithreading](https://en.wikipedia.org/wiki/Simultaneous_multithreading), SMT will be disabled.
**Should I use a userns image or not? What's the difference?**
[USERNS](USERNS.md)
**How do I install `x`?**
1. Check if it's already installed using `rpm -qa | grep x`
2. Check if there's a flatpak available at https://flathub.org
3. Consider using distrobox or nix to install it
4. Layer it using `rpm-ostree install`, as a last option
**Another security project has a feature that's missing in secureblue, can you add it?**
First check if the README already has an equivalent or better feature. If it doesn't, open a new github issue.

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## Customization
If you want to add your own customizations on top of secureblue, you are advised strongly against forking. Instead, create a repo for your own image by using [startingpoint](https://github.com/ublue-os/startingpoint), then change your `base-image` to a secureblue image. This will allow you to apply your customizations to secureblue in a concise and maintainable way, without the need to constantly sync with upstream.
If you want to add your own customizations on top of secureblue, you are advised strongly against forking. Instead, create a repo for your own image by using [startingpoint](https://github.com/ublue-os/startingpoint), then change your `base-image` to a secureblue image. This will allow you to apply your customizations to secureblue in a concise and maintainable way, without the need to constantly sync with upstream.
## FAQ
[FAQ](FAQ.md)
## Installation