Hmm it seems to be a duplicate of https://bugs.edge.launchpad.net/wubi/+bug/207137. Although in that case often the error appears at the end of the ISO extraction operation. A workaround is to use the ISO directly as opposed to the CD. Put wubi.exe and the ISO in the same directory and launch wubi.exe.
Hmm it seems to be a duplicate of https:/ /bugs.edge. launchpad. net/wubi/ +bug/207137. Although in that case often the error appears at the end of the ISO extraction operation. A workaround is to use the ISO directly as opposed to the CD. Put wubi.exe and the ISO in the same directory and launch wubi.exe.