made README better

Added info on how to check requirements

README.md

@@ -39,11 +39,11 @@ with anyone currently at risk of death in overcrowded prisons.
 
 ## Requirements
 
-- [systemd-networkd v248 or more][batman-systemd]
-- Linux kernel with batman-adv module
+- [systemd-networkd v248 or greater][batman-systemd]
+- Linux kernel with [batman-adv v2021.0][batman-systemd] or greater
 - [iwd][] for controlling the WiFi adapter
-- python3
-- python3-setuptools, for building and installing naxalnet
+- python (atleast 3.6)
+- python setuptools, for building and installing naxalnet
 - [python-systemd][], for logging to systemd journal
 - [dasbus][], for communicating with iwd
 - two or more machines with a WiFi adapter having ibss support, called
@@ -53,8 +53,8 @@ with anyone currently at risk of death in overcrowded prisons.
 
 ## Installing
 
-This program is available in the AUR for Arch users. Building
-manually for other distributions may not always work.
+This program is available in the AUR for Arch users. Users of other
+distributions will have to build manually.
 
 ### Arch Linux
 
@@ -65,21 +65,17 @@ development version) from the AUR with your favourite helper:
 yay -S naxalnet
 ```
 
-Optionally, [setup systemd-resolved][arch-resolved] for DNS if any
-of the nodes have internet access. [Start naxalnet][startnx] when
-you need it.
+Optionally, [setup systemd-resolved][arch-resolved] for DNS. [Start
+naxalnet][startnx] when you need it.
 
-### Ubuntu
+### Debian or Ubuntu
 
-naxalnet is not packaged for Ubuntu, so you will have to build
-and install it manually.
-Currently, only the **unreleased 21.10** comes with the
-required version of systemd. Therefore, naxalnet **won't work on Ubuntu
-21.04 or older**.
+naxalnet is not packaged for Debian or Ubuntu, so you will have to build
+and install it manually. Currently, only Debian experimental and Ubuntu
+21.10 comes with the required version of systemd. Therefore, naxalnet
+requires **Debian experimental** or **Ubuntu 21.10 or greater** to work.
 
-<!-- TODO: remove this message if systemd 248 arrives in 21.04 -->
-
-Install the requirements from the Ubuntu repositories:
+Install the requirements from the repositories:
 
 ```sh
 # batctl is optional
@@ -106,7 +102,24 @@ Now head over to the [next section][install-manual] to install naxalnet.
 
 ### Manually
 
-Install the [requirements][requirements].
+Verify that the [requirements][] are of required versions.
+
+```sh
+# Should be greater than or equal to 2021.0
+batctl -v
+
+# 248 or greater
+systemctl --version
+
+# Atleast 4.4
+uname -r
+
+# >= 3.6
+python3 --version
+
+# Check for IBSS (ad-hoc) support in your WiFi firmware or driver
+iw phy | grep -iq ibss && echo "IBSS is supported" || echo "IBSS not supported"
+```
 
 Clone the naxalnet repo and cd into it.
 
@@ -135,7 +148,8 @@ To upgrade, clean the build files, update the repo and reinstall:
 make clean
 git pull
 make
-sudo make uninstall install
+sudo make uninstall
+sudo make install
 ```
 
 This will keep the configuration files.