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How to install Qt 5.11.2 on Ubuntu 18.04?
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To install St 5.11.2 on Ubuntu 18.04, get the Qt installer file from the Qt download page:

wget https://download.qt.io/new_archive/qt/5.11/5.11.2/qt-opensource-linux-x64-5.11.2.run

Make the file executable:

chmod +x qt-opensource-linux-x64-5.11.2.run

Execute the file:

./qt-opensource-linux-x64-5.11.2.run

You should see the Qt installer:

Snapshoot of the Qt installer window

Follow the steps in the installer. Once the installation is completed, Qt Creator should appear in applications list.