Tips & Tricks

Resources

• Immutable bit : https://www.continualintegration.com/miscellaneous-articles/all/what-is-the-immutable-bit-vs-the-sticky-bit/

Commands

• Finding largest files on a Linux system

  sudo find /home/ -type f -exec du -b {} + 2>/dev/null | sort -rh | head -20

• Ubuntu RDP Problem

  #!/bin/bash
  # =============================================================================
  # Ultimate All-in-One xRDP Installer for Ubuntu 24.04 (GNOME/Wayland)
  # → Removes broken repo version completely
  # → Installs latest xRDP via c-nergy script in CUSTOM mode (-c) + sound (-s)
  # → Fully working: clipboard, drives, sound, smooth performance, no black screen
  # Tested and working perfectly on Ubuntu 24.04.3 as of Nov 29, 2025
  # =============================================================================
   
  set -e  # Exit on any error
   
  echo "=== Stopping and completely removing any old/broken xRDP installation ==="
  sudo systemctl stop xrdp xrdp-sesman 2>/dev/null || true
  sudo apt purge -y xrdp xorgxrdp pipewire-module-xrdp libpipewire-0.3-modules-xrdp libxrdp* 2>/dev/null || true
  sudo rm -rf /etc/xrdp /var/run/xrdp* /etc/polkit-1/localauthority/50-local.d/*xrdp* 2>/dev/null || true
  sudo deluser xrdp ssl-cert 2>/dev/null || true
  sudo apt autoremove -y
   
  echo "=== Disabling built-in GNOME Remote Desktop (it conflicts) ==="
  gsettings set org.gnome.desktop.remote-desktop.rdp enable false || true
  systemctl --user stop gnome-remote-desktop.service 2>/dev/null || true
  systemctl --user mask gnome-remote-desktop.service 2>/dev/null || true
   
  echo "=== Downloading latest c-nergy xrdp-installer v1.5.5 (Oct 31 2025) ==="
  wget -q --show-progress -O xrdp-installer-1.5.5.zip https://www.c-nergy.be/downloads/xRDP/xrdp-installer-1.5.5.zip
   
  echo "=== Extracting ==="
  unzip -o xrdp-installer-1.5.5.zip
   
  echo "=== Making executable ==="
  chmod +x xrdp-installer-1.5.5.sh
   
  echo "=== Running installer in CUSTOM mode with sound redirection (-c -s) ==="
  echo "   This will compile the absolute latest xrdp (0.10.x develop) – takes 5–10 min"
  echo "   Automatically selecting Ubuntu GNOME (option 1) when asked"
   
  # Auto-answer "1" for the desktop selection prompt (ubuntu = GNOME)
  printf "1\n" | ./xrdp-installer-1.5.5.sh -c -s
   
  echo "=== Enabling and starting xRDP service ==="
  sudo systemctl enable --now xrdp
   
  echo "=== Opening firewall port (if ufw is active) ==="
  sudo ufw allow 3389/tcp 2>/dev/null || true
   
  echo ""
  echo "╔══════════════════════════════════════════════════════════════════════════╗"
  echo "║                     INSTALLATION COMPLETED SUCCESSFULLY!                 ║"
  echo "║                                                                          ║"
  echo "║  → Reboot is HIGHLY recommended (required for sound to work perfectly)   ║"
  echo "║      Run: sudo reboot                                                    ║"
  echo "║                                                                          ║"
  echo "║  → After reboot, connect from Windows RDP (mstsc) to this machine's IP   ║"
  echo "║    You will get the blue xrdp login screen → use your Ubuntu username    ║"
  echo "║    and password → full desktop with sound, clipboard, drives, etc.       ║"
  echo "║                                                                          ║"
  echo "║  This is the only setup that actually works reliably on Ubuntu 24.04     ║"
  echo "╚══════════════════════════════════════════════════════════════════════════╝"

• Server Fan
  • By transang : https://transang.me/three-ways-to-create-a-startup-script-in-ubuntu/
  • Systemmd : https://www.digitalocean.com/community/tutorials/understanding-systemd-units-and-unit-files

  sudo nano Startup.sh 
   
  #!/bin/bash
  modprobe -r kvm_intel kvm
  ipmitool -H 192.168.99.20 -U USERID -P PASSW0RD raw 0x3a 0x07 0x03 0x00 0x01
  ipmitool -H 192.168.99.20 -U USERID -P PASSW0RD raw 0x3a 0x07 0x01 0x00 0x01
  ipmitool -H 192.168.99.20 -U USERID -P PASSW0RD raw 0x3a 0x07 0x02 0x00 0x01
   
  sudo chmod +x Startup.sh
  sudo nano /etc/systemd/system/Startup.service
   
  [Unit]
  Description=Startup Script
  After=network.target  
   
  [Service]
  ExecStart=/usr/local/bin/Startup.sh
  Type=simple
  User=root  
  Restart=always  
      
  [Install]
  WantedBy=multi-user.target # Or default.target
   
  sudo systemctl daemon-reload
  sudo systemctl enable Startup.service
  sudo systemctl start Startup.service
   
   
   
  # Anotehr Way [Not reliable]
  crontab -e
  @reboot /path/to/your_script.sh

• External Hard Drive Issues
  • Commands

    sudo ntfsfix -d /dev/sdb1

• Virtualbox
  • Nested VM grayed

    VBoxManage list vms
    VBoxManage modifyvm "Your_VM_Name" --nested-hw-virt on

• Logging

  nano ~/.zshrc
   
  # Add this 
  if [ -z "$SCRIPT_LOGGING" ]; then 
  	export SCRIPT_LOGGING=1 
  	LOG_DIR="$HOME/Terminal_logs" 
  	mkdir -p "$LOG_DIR" 
  	LOG_FILE="$LOG_DIR/session_$(date +%Y-%m-%d_%H-%M-%S).log" 
  	echo "[*] Auto-logging session to: $LOG_FILE" 
  	script -q -a -f "$LOG_FILE" 
  	exit 
  fi
   
  source ~/.zshrc

• Copy Large File

  cat file.txt | xclip -selection clipboard

• Open PDF

xdg-open sql.pdf

• Last 24h edited files

find /etc -mtime -1 -type f

• Tailscale

echo 'net.ipv4.ip_forward = 1' | sudo tee -a /etc/sysctl.d/99-tailscale.conf
echo 'net.ipv6.conf.all.forwarding = 1' | sudo tee -a /etc/sysctl.d/99-tailscale.conf
sudo sysctl -p /etc/sysctl.d/99-tailscale.conf
 
# server
sudo tailscale up --advertise-routes=10.1.92.0/22
 
# Clients
sudo tailscale up --accept-routes

• Debian ISO CD fix

  sed -i '/cdrom/ s/^/#/' /etc/apt/sources.list

• Immutable

  lsattr /etc/resolv.conf
  chattr -i /etc/resolv.conf