troubleshooting.md

@@ -25,3 +25,21 @@ If the error still occurs, you have to link the linux headers source tree to the
 ```bash
 root@raspberry:~# ln -s /usr/src/linux-headers-$(uname -r) /lib/modules/$(uname -r)/build
 ```
+
+## APT says `build-essential` could not be found
+
+If your package manager couldn't fint this package, you most probably just need to update your repository index with
+
+```bash
+root@raspberry:~# apt update
+```
+
+If this doesn't fix the error, you have to install the required packages manually:
+
+```bash
+root@raspberry:~# apt install make gcc libc6.1-dev g++ hurd-dev
+```
+
+## Permission denied
+
+You have to be root to execute the commands. Please do so by typing `su` and then entering your root password. If you don't know what your root password is, you're most probably screwed and have to reinstall your system.
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