Ubuntu 18.04 (Bionic) and Ubuntu 20.04 (Focal)

This command works as expected and installs Qt 5.12 (or similar) from the official Ubuntu repositories.

sudo apt install qt5-default qtbase5-dev qtchooser qttools5-dev-tools

sudo apt-get install -y libqt5svg5-dev
sudo apt-get install -y libqt5x11extras5-dev
sudo apt install libqt5charts5-dev

Ubuntu 22.04 (Jammy) and later

sudo apt install qtbase5-dev qtchooser qttools5-dev-tools qttools5-dev

ubuntu 24

sudo apt install qtbase5-dev qt5-qmake qttools5-dev-tools

qt 5.15.2

📌 Why is Qt 5.15.2 considered the best? Last free and open-source LTS version before the LGPL license was restricted.

Widely adopted by large open-source projects like CloudCompare, ROS, KDE, etc.

Supported by nearly all Linux distributions (Ubuntu, Debian, Fedora).

Compatible with modern C++ compilers (GCC 9+, Clang 10+, MSVC 2017/2019).