Reading package lists DoneBuilding dependency tree DoneReading state information DonePackage qt5-default is not available but is referred to by another packageThis may mean that the package is missing

The package 'qt5-default' is not available in the current package repository. This could be because the package is missing, has been deprecated, or is only available from a different source.

To resolve this issue, you can try the following:

1. Update the package repository by running the command: sudo apt update

2. Install the 'qtbase5-dev' package instead, which provides similar functionality: sudo apt install qtbase5-dev

If the above steps do not work, you may need to search for alternative sources or packages that provide the required functionality.