This is how i installed Qt on Ubuntu 24.04.2.

• First step go to Qt.io
• Click on the “Download. Try.” button.
• Click on “Community User”
• Scroll down to “Looking for Qt Binaries” and click download”
• Download (click) the Linux button.

Now ytou will have a qt-online-installer-linux-x64-4.10.0.run Make the file executable by running chmod +x qt-online-installer-linux-x64-4.10.0.run

You will need to create a Qt account and after this it will be installed.