This combination does not work.
I get:
Package libpng12-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
Package python-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
python3-pip
Package qt5-default is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package ‘python-pip’ has no installation candidate
E: Package ‘libpng12-dev’ has no installation candidate
E: Package ‘qt5-default’ has no installation candidate
Looking in indexes: Simple index, piwheels - Simple index
Requirement already satisfied: pyusb in /usr/local/lib/python3.9/dist-packages (1.2.1)
find: ‘/usr/lib/arm-linux-gnueabihf/’: No such file or directory
Could not find libts library
8-Dale