Merge pull request #61 from tony1661/patch-5

Fix - Debian 10

docs/install.md

@@ -3,8 +3,7 @@ These instructions are tested working on:\
 :heavy_check_mark: Ubuntu 20.04\
 :heavy_check_mark: Ubuntu 18.04\
 :x: Ubuntu 16.04 (fails when starting the http server `uvicorn main:app --host=0.0.0.0`)\
-:x: Debian 10\
-  (fails when starting the wg0 interface`[#] ip link add wg0 type wireguard\nRTNETLINK answers: Operation not supported\nUnable to access interface: Protocol not supported\n[#] ip link delete dev wg0\nCannot find device "wg0"\n'`)\
+:heavy_check_mark: Debian 10\
 :x: Debian 9
   (fails at `pip install -r requirements.txt` error: `Could not find a version that satisfies the requirement fastapi (from -r requirements.txt (line 2)) (from versions: `)
 
@@ -102,10 +101,68 @@ You should now see the following
 #INFO:     Application startup complete.
 #INFO:     Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit) 
 ``` 
-
-## 6. Default routing not working?
+## 6. Troubleshooting tips
+### Default routing not working?
 Try these.
 
 PostUp `iptables -A FORWARD -i %i -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE; ip6tables -A FORWARD -i %i -j ACCEPT; ip6tables -t nat -A POSTROUTING -o eth0 -j MASQUERADE`
 
 PostDown `iptables -D FORWARD -i %i -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE; ip6tables -D FORWARD -i %i -j ACCEPT; ip6tables -t nat -D POSTROUTING -o eth0 -j MASQUERADE`
+
+### Debain 10 wg0 won't start
+When you try to start wg0 from the web interface, you may see on your terminal session:
+`RNETLINK answers: Operation not supported. Unable to access interface: Protocol not supported`
+
+This can sometimes be fixed with ```sudo apt upgrade```
+
+To fix this, we need to reconfigure the Kernel module. In some cases, the following commands will fix your issue:
+```
+dpkg-reconfigure wireguard-dkms
+modprobe wireguard
+```
+
+You may get an error on the first command
+```
+Module build for kernel 4.19.0-10-cloud-amd64 was skipped since the
+kernel headers for this kernel does not seem to be installed.
+```
+
+We'll need to install the Kernel headers.
+
+Find out which Kernel we are already on
+```
+uname -r
+```
+
+Search if your Kernel headers are in the repositories.
+```
+apt search linux-headers-$(uname -r)
+```
+
+ If so then install them:
+ ```
+apt install linux-headers-$(uname -r)
+
+```
+
+If not, we'll need to upgrade your Kernel. My Kernel was 4.19.0.10 so I did a search for 4.19.0 and found 4.19.0.11. This will be a minnor release so nothing to be too worried about.
+```
+apt search linux-headers-*
+```
+
+Install the new Kernel and Reboot
+```
+apt install linux-image-4.19.0-11-cloud-amd64
+reboot
+```
+
+Install the headers for your Kernel
+```
+apt install linux-headers-4.19.0-11-cloud-amd64
+```
+
+Reconfigure your dkms module and load it.
+```
+dpkg-reconfigure wireguard-dkms
+modprobe wireguard
+```