systemd unit file uses relative rather than absolute paths

On boot, journalctl reports this error:
[/lib/systemd/system/friendly-recovery.service:14] Executable path is not absolute, ignoring: dmesg --console-off

The fix is:
sed 's#dmesg#/bin/dmesg#' /lib/systemd/system/friendly-recovery.service

Background:
Ubuntu 14.10, with systemd
friendly-recovery: 0.2.26

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: friendly-recovery 0.2.26 [modified: lib/systemd/system/friendly-recovery.service]
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
Date: Sat Dec 6 15:44:23 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-11-04 (762 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
PackageArchitecture: all
SourcePackage: friendly-recovery
UpgradeStatus: Upgraded to utopic on 2014-11-22 (14 days ago)