I just looked. The problem is that "/proc/acpi/event" has been deprecated. acpid is still using it though. So if the kernel was not compiled with legacy support for /proc/acpi/event (for backwards compatibility), then it will fail to start / configure - exactly your problem.
Debian fixed this problem with acpid version 1.0.8-4. Unfortunately, it hasn't hit Ubunut's repositories yet, since their latest version is 1.0.6-9ubuntu4.9.04.3
I've just noticed Debian actually has a 1.0.10-4 version available. If I read correctly, you use Ubuntu AMD64, right? So give this hack a shot:
Download Debian's version:
Code:
wget http://ftp.fr.debian.org/debian/pool/main/a/acpid/acpid_1.0.10-4_amd64.deb
Install it (cross your fingers!):
Code:
sudo dpkg -i acpid_1.0.10-4_amd64.deb
And check if it's indeed the latest version if successful:
(Returns
acpid-1.0.10)
If that worked, then you can try finishing up the rest of the installation (that's still pending at this point) with:
Code:
sudo dpkg --configure -a
Hope this works!