AGM-280 Specified supported linux distributions

Author: anastasiia-fedotova

docs/adguard-for-linux/adguard-for-linux.md

@@ -5,6 +5,16 @@ sidebar_position: 1
 
 AdGuard for Linux, also known as AdGuard CLI, is a command-line ad blocker. You can use it on Linux or macOS devices.
 
+## Supported Linux distributions
+
+AdGuard CLI supports the following Linux distributions:
+
+- Debian stable 10 or later
+- Ubuntu LTS 22.04, 24.04, or later
+- RHEL / Fedora
+
+On Linux distributions that are **not based on Debian or Red Hat**, the automatic certificate installation script may not work properly.
+
 Below are commands you may need to log in, enable protection, and manage the AdGuard settings.
 
 - [Installation, setup, and removal](/adguard-for-linux/installation)
@@ -15,4 +25,4 @@ On Linux, press `Ctrl+Alt+T`. On your Mac, type `Terminal` in the search field.
 
 To view all available commands, enter:
 
-    adguard-cli --help-all
+    adguard-cli --help-all

docs/adguard-for-linux/settings.md

@@ -84,6 +84,17 @@ Use the `config` command to configure AdGuard for Linux. Subcommands:
     - `proxy_mode`: Proxy mode (`manual` or `auto`)
 - `get`: Get the current status of the above options
 
+:::note
+
+The Automatic mode can only be used if the following requirements are met:
+
+- `iptables` is installed and running (either `nft` or `legacy`)
+- `iptables` supports the `nat` table for both IPv4 and IPv6
+- `iptables` supports the `REDIRECT` and `QUEUE` chains for both IPv4 and IPv6
+- The `sudo` package is installed
+
+:::
+
 ## Manage filters
 
 Use the `filters` command to configure AdGuard for Linux. Subcommands: