[ziber@apollo] (~) $ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  linux-generic-lts-utopic linux-headers-generic-lts-utopic
  linux-image-generic-lts-utopic
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up bird (1.4.0-1) ...
start: Job failed to start
invoke-rc.d: initscript bird6, action "start" failed.
dpkg: error processing package bird (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 bird
E: Sub-process /usr/bin/dpkg returned an error code (1)