LightZone, a free non‑destructive RAW editor that many users find refreshing compared to GIMP or Lightroom, isn’t included in Ubuntu’s default repositories but can be installed on Ubuntu 20.04 with a handful of commands. First you update your system and install build essentials, image libraries, Qt5 tools and CMake—any missing dependency will cause the compilation to choke. After cloning the latest source from GitHub you build it in a dedicated directory with CMake, run make using all CPU cores for speed, then install, and if Qt header errors appear you’ll need qttools5‑dev‑tools or an explicit override of the default Qt4 requirement. Finally launch LightZone to confirm the splash screen appears; if it crashes you can debug with LD_DEBUG, and for convenience create a desktop launcher so you can start the editor from your application menu on Ubuntu 20.04.

Install LightZone on Ubuntu 20.04 – get your RAW photos looking sharp

If you’re still grinding through the photo‑editing mess that is GIMP or Lightroom, LightZone’s free “non‑destructive” workflow might feel like a breath of fresh air. It’s not in the default repos, but don’t let that scare you—you can get it up and running on Ubuntu 20.04 with a handful of commands.

Prerequisites: make sure your system is ready

1. Update your package lists

   sudo apt update && sudo apt upgrade -y

Keeping everything fresh prevents dependency headaches later on.

2. Install build essentials and libraries

LightZone needs a handful of development packages to compile:

   sudo apt install build-essential libjpeg-dev libtiff5-dev \
         libpng-dev libglib2.0-dev libqt4-dev qttools5-dev-tools \
         cmake git -y

These provide the compiler, image libraries and Qt framework that LightZone relies on. Skipping any of them will make the build choke.

Grab the source

The upstream project stopped shipping Debian packages a while back, so you’ll have to pull the code yourself:

git clone https://github.com/Lightzone/lightzone.git
cd lightzone

I’ve seen folks run into trouble when they grab an older tag that still expects Qt 4.5. Using the master branch keeps it up to date with newer libraries.

Compile and install

mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Release
make -j$(nproc)
sudo make install

Why -j$(nproc)? It tells make to use all your CPU cores, cutting the compile time from a half‑hour to just a few minutes on an average laptop.

If you hit a “Could not find Qt” error, double‑check that qttools5-dev-tools is installed—Qt 5.15 ships with Ubuntu 20.04, but the build system still looks for Qt 4 headers by default unless overridden.

Verify it works

Run LightZone from the terminal:

lightzone

If a splash screen pops up and you see “LightZone – The free RAW editor,” congratulations—everything’s wired together. If it crashes on startup, try launching with debug flags to see missing libs:

LD_DEBUG=libs lightzone

I’ve seen this happen after an accidental removal of libjpeg8 during a system cleanup; the debugger will show which library is missing.

Optional: Create a desktop shortcut

If you’re not a terminal fan, drop a small launcher into your applications menu:

cat <<EOF | sudo tee /usr/share/applications/lightzone.desktop
[Desktop Entry]
Name=LightZone
Comment=Non-destructive RAW editor
Exec=/usr/local/bin/lightzone %F
Icon=lightzone
Terminal=false
Type=Application
Categories=Graphics;Photography;
EOF

Refresh your menu (log out/in or sudo update-desktop-database) and you’ll have a clickable icon.

LightZone may feel a bit “old school” compared to the slick cloud editors out there, but its non‑destructive tweak engine still deserves a spot in any photo lover’s toolkit—especially if y