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+#!/bin/bash
+# Script to install JupyterHub (via TLJH) and RStudio Server on Ubuntu 24.04 LTS
+
+# --- Configuration ---
+# Set the desired admin username and password for JupyterHub
+# !!! CHANGE THESE VALUES !!!
+ADMIN_USER="your_admin_user" 
+ADMIN_PASSWORD="your_admin_password"
+
+# RStudio Server .deb package URL for Ubuntu 22/24 (noble/jammy)
+# Always check the Posit website for the latest version and correct URL
+RSTUDIO_DEB_URL="https://download2.rstudio.org/server/jammy/amd64/rstudio-server-2023.12.1-402-amd64.deb"
+RSTUDIO_DEB_FILENAME="rstudio-server.deb"
+# ---------------------
+
+echo "--- Updating and installing prerequisites ---"
+apt update
+apt upgrade -y
+apt install -y curl git gdebi-core software-properties-common dirmngr ufw
+
+# Enable and configure UFW firewall
+echo "--- Configuring UFW firewall ---"
+ufw allow 80/tcp  # For JupyterHub/TLJH (HTTP)
+ufw allow 443/tcp # For JupyterHub/TLJH (HTTPS)
+ufw allow 8787/tcp # For RStudio Server
+ufw enable -y
+echo "Firewall configured: Ports 80, 443, and 8787 allowed."
+
+# ----------------------------------------------------
+# 1. Install The Littlest JupyterHub (TLJH)
+# ----------------------------------------------------
+echo "--- Installing The Littlest JupyterHub (TLJH) ---"
+# TLJH is a robust and easy way to install a single-server JupyterHub instance.
+# It automatically installs Python, JupyterHub, a proxy, and configuration.
+
+curl -L https://tljh.jupyter.org/bootstrap.py | sudo -E python3 - \
+    --admin "$ADMIN_USER":"$ADMIN_PASSWORD"
+
+if [ $? -ne 0 ]; then
+    echo "ERROR: TLJH installation failed. Exiting."
+    exit 1
+fi
+echo "JupyterHub (TLJH) installed successfully."
+echo "JupyterHub will be accessible via HTTP on port 80/443."
+
+# ----------------------------------------------------
+# 2. Install R and RStudio Server
+# ----------------------------------------------------
+echo "--- Installing R and RStudio Server ---"
+
+# 2a. Install R base and add the CRAN repository
+echo "--- Adding CRAN repository and installing R ---"
+# Key for CRAN
+wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc | gpg --dearmor | tee /etc/apt/trusted.gpg.d/cran_ubuntu_key.gpg >/dev/null
+
+# Add CRAN repository (noble is Ubuntu 24.04 codename)
+# We use the older 'jammy-cran40' as the noble repository might not be fully populated yet or for compatibility
+add-apt-repository -y "deb https://cloud.r-project.org/bin/linux/ubuntu noble-cran40/"
+apt update
+apt install -y r-base
+
+# 2b. Download and Install RStudio Server
+echo "--- Downloading and installing RStudio Server ---"
+wget "$RSTUDIO_DEB_URL" -O "$RSTUDIO_DEB_FILENAME"
+
+# Use gdebi to install the .deb package and resolve dependencies
+gdebi --n "$RSTUDIO_DEB_FILENAME"
+
+# Clean up
+rm "$RSTUDIO_DEB_FILENAME"
+
+if [ $? -ne 0 ]; then
+    echo "WARNING: RStudio Server installation might have failed. Check dependencies."
+else
+    echo "RStudio Server installed successfully."
+fi
+
+# ----------------------------------------------------
+# 3. Final Verification and Instructions
+# ----------------------------------------------------
+echo "--- Verification and Next Steps ---"
+echo "JupyterHub Status:"
+systemctl status jupyterhub --no-pager
+
+echo "RStudio Server Status (should be active):"
+systemctl status rstudio-server --no-pager
+
+echo ""
+echo "=========================================================="
+echo "✅ Installation Summary"
+echo "=========================================================="
+echo "JupyterHub (TLJH) is running. Access it at:"
+echo "   ➡️  http://<Your-Server-IP>/"
+echo "   Login with the admin user: **$ADMIN_USER**"
+echo "   Password: **$ADMIN_PASSWORD**"
+echo ""
+echo "RStudio Server is running on port 8787. Access it at:"
+echo "   ➡️  http://<Your-Server-IP>:8787/"
+echo "   Login with any existing **Ubuntu system user** credentials."
+echo ""
+echo "Remember to set up HTTPS for JupyterHub using tljh-config!"
+echo "=========================================================="
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