root@lubuntu:/# apt-get install linux-image-3.13.0.55-generic linux-headers-3.13.0-55-generic linux-headers-3.13.0-55
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'linux-image-3.13.0-55-generic' for regex 'linux-image-3.13.0.55-generic'
linux-image-3.13.0-55-generic is already the newest version.
The following NEW packages will be installed:
  linux-headers-3.13.0-55 linux-headers-3.13.0-55-generic
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 9,581 kB of archives.
After this operation, 76.8 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://security.ubuntu.com/ubuntu/ trusty-security/main linux-headers-3.13.0-55 all 3.13.0-55.94 [8,883 kB]
Get:2 http://security.ubuntu.com/ubuntu/ trusty-security/main linux-headers-3.13.0-55-generic amd64 3.13.0-55.94 [698 kB]
Fetched 9,581 kB in 0s (12.1 MB/s)
dpkg: unrecoverable fatal error, aborting:
 syntax error: unknown user 'amavis' in statoverride file
E: Sub-process /usr/bin/dpkg returned an error code (2)