From the bug description:
CasperMD5CheckMismatches:
./pool/restricted/n/nvidia-graphics-drivers-390/libnvidia-ifr1-390_390.138-0ubuntu2_amd64.deb
CasperMD5CheckResult: skip
It's possible you had a bad write to your media or for some other reason
its contents could not be read correctly. Please a
my 100MB win reserved partition was visible on win as D:
this is very unusual
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https://bugs.launchpad.net/bugs/1916639
Title:
failed to write the boot onto EFI partition alongside Win7
