In ubuntu20.04 qt5-default was the package name. So I tried the same and qt6-default in 22.04.
Then I tried apt-cache search qt which revealed (among many others): qt6-base-dev and qt5-base-dev.
I am unsure whether the new qt{version}-base-dev is the old qt5-default. If not: What is?
2 Answers
You need to install packages:
sudo apt install -y qtcreator qtbase5-dev qt5-qmake cmakeAnd you need to manually change the Qt version:screenshot how to manually change Qt version
Then you need to manually change Qt version in the Kits tab:screenshot on the Kits tab
3Why don't you install it with their online installer.
Once downloaded, chmod +x qt-unified-linux-<arch>-<version>-online.run then ./qt-unified-linux-<arch>-<version>-online.run