package acpid 1.0.6-9ubuntu4.9.04.3 failed to install/upgrade: subprocess post-installation script returned error exit status 1

Binary package hint: acpid

Setting up acpid (1.0.6-9ubuntu4.9.04.3) ...
 * Loading ACPI modules... [ OK ]
 * Starting ACPI services... acpid: can't open /proc/acpi/event: Device or resource busy
invoke-rc.d: initscript acpid, action "start" failed.
dpkg: error processing acpid (--configure):
 subprocess post-installation script returned error exit status 1

ProblemType: Package
Architecture: i386
DistroRelease: Ubuntu 9.04
ErrorMessage: subprocess post-installation script returned error exit status 1
Package: acpid 1.0.6-9ubuntu4.9.04.3
SourcePackage: acpid
Title: package acpid 1.0.6-9ubuntu4.9.04.3 failed to install/upgrade: subprocess post-installation script returned error exit status 1
Uname: Linux 2.6.28-11-generic i686