Your postinst seems to be fine.
Can you check if that file and /var/lib/dpkg/info/ have the executable bit set? 
Can you check if /var is mounted with the exec flag set?
Can you try to manually execute that script?
If worst come to worse, you can try to force the installation with:

sudo dpkg --force-all -i /var/cache/apt/archives/libgnome-
cni_2.12.7-4_powerpc.deb

Its a dangerous command to give, so try other solutions first.
This may not solve others problem you have which could be related to a corrupt 
file system but at least should solve this one.
Anyhow, I'm transforming this into a question since there doesn't seem to be 
any bug.

** Changed in: ubuntu
       Status: Incomplete => Invalid

** bug changed to question:
   https://answers.edge.launchpad.net/ubuntu/+question/41303

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fails to install or remove upon dpkg or apt-gotten for install
https://bugs.launchpad.net/bugs/254266
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