Bug#946882: blk-availability.service: may fail or unmount filesystems too soon

[Antonio]

I don't know if it's relevant, but I'm getting this a warning at boot with
this service:

systemd[1]: /lib/systemd/system/blk-availability.service:10: Neither a
valid executable name nor an absolute path: ${exec_prefix}/bin/true

lvm2/2.03.09-2