dpkg: error processing linux-signed-generic (--configure):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 linux-image-3.5.0-21-generic
 linux-image-extra-3.5.0-21-generic
 linux-image-generic
 linux-generic
 linux
 linux-signed-image-3.5.0-21-generic
 linux-signed-image-generic
 linux-signed-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)