I'm not sure why apport filed this under grub-installer since it appears to have worked fine. The logs look like ubiquity was trying to do a mass apt install rather than it's normal process of copying the live system to the drive, and this failed due to broken/held packages. Reassigning to ubiquity.
** Package changed: grub-installer (Ubuntu) => ubiquity (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1164877 Title: at the end of installation-process I got the information that something went wrong. It was afte I clicked at the buttom "go on testing" ("Ausprobieren fortsetzen" in german language). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1164877/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs