install qt6.2 in ubnutu 18.04

When I install Qt6 in ubuntu18.04, the qt report Error during installation process (qt.qt6.612.gcc_64): Could not find the needed QmakeOutputInstallerKey(qt.qt6.612.gcc_64_qmakeoutput) value on the installer object. The ConsumeOutput operation on the valid qmake needs to be called first. How to resolve the problem