[WebUI] Update NodeJS installation Guide

docs/_docs/guide/01-quickstart.md

@@ -188,10 +188,19 @@ The WebUI allows you to interactively edit subscriber data. While it is not esse
 1. *Debian and Ubuntu* based Linux distributions can install [Node.js](https://nodejs.org/) as follows:
 
     ```bash
+    # Download and import the Nodesource GPG key
     $ sudo apt update
-    $ sudo apt install curl
-    $ curl -fsSL https://deb.nodesource.com/setup_18.x | sudo -E bash -
-    $ sudo apt install nodejs
+    $ sudo apt install -y ca-certificates curl gnupg
+    $ sudo mkdir -p /etc/apt/keyrings
+    $ curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
+
+    # Create deb repository
+    $ NODE_MAJOR=20
+    $ echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
+
+    # Run Update and Install
+    $ sudo apt update
+    $ sudo apt install nodejs -y
     ```
 
 2. To install [Node.js](https://nodejs.org/) on *openSUSE*, run the following:

docs/_docs/guide/02-building-open5gs-from-sources.md

@@ -422,9 +422,19 @@ $ ./build/tests/app/app ## Both 5G Core and EPC with ./build/configs/sample.yaml
 [Node.js](https://nodejs.org/) is required to build WebUI of Open5GS
 
 ```bash
-$ sudo apt install curl
-$ curl -fsSL https://deb.nodesource.com/setup_18.x | sudo -E bash -
-$ sudo apt install nodejs
+# Download and import the Nodesource GPG key
+$ sudo apt update
+$ sudo apt install -y ca-certificates curl gnupg
+$ sudo mkdir -p /etc/apt/keyrings
+$ curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
+
+# Create deb repository
+$ NODE_MAJOR=20
+$ echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
+
+# Run Update and Install
+$ sudo apt update
+$ sudo apt install nodejs -y
 ```
 
 Install the dependencies to run WebUI

docs/_docs/platform/02-centos.md

@@ -238,11 +238,16 @@ to support IPv6.  This is done by setting the `diable_ipv6` option for
 `ogstun` to 0 (false):
 
 ```bash
+$ sysctl -n net.ipv6.conf.lo.disable_ipv6
+1
 $ sysctl -n net.ipv6.conf.ogstun.disable_ipv6
 1
 
+$ sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0
 $ sudo sysctl -w net.ipv6.conf.ogstun.disable_ipv6=0
 
+$ sysctl -n net.ipv6.conf.lo.disable_ipv6
+0
 $ sysctl -n net.ipv6.conf.ogstun.disable_ipv6
 0
 ```

docs/_docs/platform/03-fedora.md

@@ -120,6 +120,7 @@ $ cd ../
 [Node.js](https://nodejs.org/) is required to build WebUI of Open5GS
 
 ```bash
+$ sudo dnf install https://rpm.nodesource.com/pub_20.x/nodistro/repo/nodesource-release-nodistro-1.noarch.rpm -y
 $ sudo dnf -y install nodejs
 ```
 

docs/_docs/tutorial/01-your-first-lte.md

@@ -179,8 +179,21 @@ $ sudo apt install open5gs
 The following shows how to install the Web UI of Open5GS.
 
 ```bash
-$ curl -fsSL https://deb.nodesource.com/setup_18.x | sudo -E bash -
-$ sudo apt install nodejs
+# Download and import the Nodesource GPG key
+$ sudo apt update
+$ sudo apt install -y ca-certificates curl gnupg
+$ sudo mkdir -p /etc/apt/keyrings
+$ curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | sudo gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
+
+# Create deb repository
+$ NODE_MAJOR=20
+$ echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | sudo tee /etc/apt/sources.list.d/nodesource.list
+
+# Run Update and Install
+$ sudo apt update
+$ sudo apt install nodejs -y
+
+# Install the WebUI of Open5GS
 $ curl -fsSL https://open5gs.org/open5gs/assets/webui/install | sudo -E bash -
 ```
 

vagrant/centos/Vagrantfile

@@ -12,8 +12,7 @@ Vagrant.configure("2") do |config|
 
   # Every Vagrant development environment requires a box. You can search for
   # boxes at https://vagrantcloud.com/search.
-  config.vm.box = "centos/stream8"
-  config.vm.box_version = "20210210.0"
+  config.vm.box = "generic/centos8"
 
   # Disable automatic box update checking. If you disable this, then
   # boxes will only be checked for updates when the user runs