I agree this is a separate issue. I just did a fresh Kubuntu 19.04 amd64 UEFI installation (installer ISO downloaded on 2019-04-23) in Virtualbox, selecting the 'minimal' (set of installed packages) option and the 'install updates during installation' option set.
After installation, sudo apt update succeeded without errors and sudo apt full-upgrade reported that many packages were pending installation and many others were pending removal. See the attached output for details.
I agree this is a separate issue. I just did a fresh Kubuntu 19.04 amd64 UEFI installation (installer ISO downloaded on 2019-04-23) in Virtualbox, selecting the 'minimal' (set of installed packages) option and the 'install updates during installation' option set.
After installation, sudo apt update succeeded without errors and sudo apt full-upgrade reported that many packages were pending installation and many others were pending removal. See the attached output for details.