sorry, I lost a bit of track on your request.
Probably you might fix this issue by trying something unexpected... but first please let us know if the respective file '/etc/init.d/lvm2-lvmetad' or other files in this context exist:
ls -lah /etc/init.d/lvm*
Move the decryed files away and continue the setup
tar -czvf ~/lvm2_etad-init_script.tgz /etc/init.d/lvm2-lvmetad --remove-files
Maybe it's of some use to know a little bit more about your partition geometry / LVM: