A discussion that has come up before, but I figured I'd file a bug.
When you 'apt-get install <some-packages>' often times:
a.) update-initramfs is called more than once for the same kernel
b.) update-initramfs might not even be called (such as in bug 1466960).
some conversation with infinity in #ubuntu-devel [1] indicates that he and apw have discussed how to do solve this.
[1] http://irclogs.ubuntu.com/2015/06/19/%23ubuntu-devel.html#t18:04
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: initramfs-tools 0.103ubuntu15
ProcVersionSignature: User Name 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
ApportVersion: 2.17.3-0ubuntu4
Architecture: amd64
Date: Fri Jun 19 18:19:15 2015
Ec2AMI: ami-00000425
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.small
Ec2Kernel: aki-00000002
Ec2Ramdisk: ari-00000002
PackageArchitecture: all
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: initramfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)
