This is because you've installed the package kicad-demo from a PPA and there is no relationship between that package and the kicad-demos package from the official Ubuntu archive. If there were such a relationship then the old package would be automatically removed an the new one would replace it. Regardless, you'll need to sort this out manually by removing the PPA version of the kicad packages.
** Changed in: kicad (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1899963 Title: package kicad-demos (not installed) failed to install/upgrade: trying to overwrite '/usr/share/kicad/demos/complex_hierarchy/ampli_ht.sch', which is also in package kicad-demo 5.0.2-stable-201811280959+bee76a0~70~ubuntu18.04.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kicad/+bug/1899963/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs