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ureadahead will be reprofiled on next reboot
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dpkg: error processing package linux-headers-3.16.0-51-generic (--configure):
 package linux-headers-3.16.0-51-generic is not ready for configuration
 cannot configure (current status `half-installed')
Setting up libffi6:amd64 (3.1~rc1+r3.0.13-12ubuntu0.1) ...