dpkg: error processing linux-signed-generic (--configure):
 dependency problems - leaving unconfigured
Setting up m4 (1.4.16-3) ...
Setting up libbison-dev:amd64 (1:2.5.dfsg-2.1build1) ...
Setting up bison (1:2.5.dfsg-2.1build1) ...
update-alternatives: using /usr/bin/bison.yacc to provide /usr/bin/yacc (yacc) in auto mode
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-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