Comment 4 for bug 572612

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Daniel Hahler (blueyed) wrote : Re: package boinc-client 6.10.17+dfsg-3ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Does the directory /etc/boinc-client exist at all on your system?

However, the post-installation script should not fail if the file in non-existent probably.