Bug#946882: [ 9.720909] systemd[1]: /lib/systemd/system/blk-availability.service:10: Neither a valid executable name nor an absolute path: ${exec_prefix}/bin/true

[Anatoly Pugachev]

Looking at the file :

$ cat /lib/systemd/system/blk-availability.service
[Unit]
Description=Availability of block devices
Before=shutdown.target
After=lvm2-activation.service iscsi-shutdown.service iscsi.service
iscsid.service fcoe.service rbdmap.service
DefaultDependencies=no
Conflicts=shutdown.target

[Service]
Type=oneshot
ExecStart=${exec_prefix}/bin/true
ExecStop=/sbin/blkdeactivate -u -l wholevg -m disablequeueing -r wait
RemainAfterExit=yes

[Install]
WantedBy=sysinit.target


something is forgot to substitute prefix ${exec_prefix} ...