I'm experiencing this same problem. I can't install Ubuntu 18.04 or
Kubuntu 18.04. The installer crashes, or reports that grub cannot be
installed and then crashes.
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Public bug reported:
The installer failed during the grub2 installation. The error said that
the uefi could not be installed to target.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic
