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* **Firewall:** To enable [ufw](https://en.wikipedia.org/wiki/Uncomplicated_Firewall) (uncomplicated firewall), open terminal and enter `sudo ufw status` and if it's not yet enabled, enter `sudo ufw enable`. The default is usually all you need, but you have the options of adding additional rules. Use `sudo ufw disable` to disable the firewall. To call up a graphical interface inside the terminal, first install gufw and install x11-xserver-utils. Next type the following command: `DISPLAY=:0 xhost +` and hit enter, resulting in: `access control disabled, clients can connect from any host`. Now type: `DISPLAY=:0 GDK_BACKEND=x11 sudo gufw` and the graphical version will appear right in the terminal. Note that after you close the terminal, the app icon in the phone's app list will not be operational unless you repeat the above process, at least unless someone adapts it later.
* **IMEI:** To find the IMEI of your Librem 5, go to `Settings` > `Mobile` > `Modem Details`.
* **Notifications:** Accessed by touching the battery icon at the top right corner of the screen.
* **Ringtones:** Customize rintones following this [blog post](https://sspaeth.de/2021/03/customizing-the-librem5-ringtone/).
* **Root account:** Locked by default. So there is no root password available. More technical details [here](https://source.puri.sm/Librem5/image-builder/-/merge_requests/123). Unlock root account with `sudo passwd`, check out [this discussion](https://forums.puri.sm/t/what-does-locking-the-root-password-do/10895) for more background.
* **Terminal:** Access additional Terminal keyboard controls by clicking on the globe icon (reveals Ctrl, Alt, and arrow keys, plus other symbols, controls, and Function keys - including Esc and Tab; press the `>_` key to see the extras). // Here's a quick and fun introduction to basic Terminal commands: https://ubuntu.com/tutorials/command-line-for-beginners#1-overview
* **User name:** Default user name is: `purism`. Additional user names can be added from the terminal; at present this is not supported in the `Settings` GUI.
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