This bug is due to usb burning tool, I had the same issue with Ultraiso
but with the latest version of Rufus; I didn't face it again.
Thank you
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https://bugs.launchpad.net/bugs/500822
Public bug reported:
i was trying to install OS alongside windows, but it failed in last
giving grub error.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63 [modified: usr/share/ubiquity/apt-setup]
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux