Hi
I guess you are having 2 issues here:
- /boot is in a logical volume (as a directory under /). Converter expects /boot to be in a basic volume
- grub-install is expected to also be an issue. Converter calls "grub-install -v" to determine the GRUB version. However this syntax has been changed with the grub version in Ubuntu 14.04, '-v' meaning 'verbose', not 'version'.
These defects will be fixed in the next Converter version. As a workaround you may try converting '/' to basic volume at the destination. Also see this thread Re: ubuntu p2v - converter fails generic error for a hint how to hack the grub-install script (it is about a different but similar issue)
HTH
Plamen