Your log shows attempts to access unofficial package archives during the install, which should not happen with official Ubuntu images; and your bug report also shows that /boot/grub/efi.img on the image does not match the official Ubuntu image. Where did you download this from?
** Changed in: ubiquity (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876477 Title: install broken To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1876477/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs