On 2015-06-25 & 26 I created Precise and Trusty instances. They contains the directories:
```
/etc/apt/apt.conf.d/apt.conf.d/
/etc/apt/preferences.d/preferences.d/
```
When I run 'apt-get update' it exits 0 but says:
```
N: Ignoring 'apt.conf.d' in directory '/etc/apt/apt.conf.d/' as it is not a regular file
N: Ignoring 'sources.list.d' in directory '/etc/apt/sources.list.d/' as it is not a regular file
```
When I run 'apt-get upgrade' it exits 0 but says:
```
N: Ignoring 'apt.conf.d' in directory '/etc/apt/apt.conf.d/' as it is not a regular file
N: Ignoring 'sources.list.d' in directory '/etc/apt/sources.list.d/' as it is not a regular file
N: Ignoring 'sources.list.d' in directory '/etc/apt/sources.list.d/' as it is not a regular file
N: Ignoring 'preferences.d' in directory '/etc/apt/preferences.d/' as it is not a regular file
N: Ignoring 'sources.list.d' in directory '/etc/apt/sources.list.d/' as it is not a regular file
```
The contents of these directories differs from that of their parents:
```
/etc/apt/apt.conf.d/01autoremove
/etc/apt/apt.conf.d/01autoremove-kernels
/etc/apt/apt.conf.d/20auto-upgrades
/etc/apt/apt.conf.d/20changelog
/etc/apt/apt.conf.d/50unattended-upgrades
/etc/apt/apt.conf.d/70debconf
/etc/apt/apt.conf.d/80old-releases-proxy
/etc/apt/apt.conf.d/80security-ubuntu-proxy
/etc/apt/apt.conf.d/80ubuntu-cloud-archive-proxy
/etc/apt/apt.conf.d/90cloud-init-pipelining
/etc/apt/apt.conf.d/90no-recommends
/etc/apt/apt.conf.d/apt.conf.d/01autoremove
/etc/apt/apt.conf.d/apt.conf.d/01autoremove-kernels
/etc/apt/apt.conf.d/apt.conf.d/10periodic
/etc/apt/apt.conf.d/apt.conf.d/15update-stamp
/etc/apt/apt.conf.d/apt.conf.d/20archive
/etc/apt/apt.conf.d/apt.conf.d/20auto-upgrades
/etc/apt/apt.conf.d/apt.conf.d/20changelog
/etc/apt/apt.conf.d/apt.conf.d/50unattended-upgrades
/etc/apt/apt.conf.d/apt.conf.d/70debconf
/etc/apt/apt.conf.d/apt.conf.d/80old-releases-proxy
/etc/apt/apt.conf.d/apt.conf.d/80security-ubuntu-proxy
/etc/apt/apt.conf.d/apt.conf.d/80ubuntu-cloud-archive-proxy
/etc/apt/apt.conf.d/apt.conf.d/80workaround-squid-issues
/etc/apt/apt.conf.d/apt.conf.d/90cloud-init-pipelining
/etc/apt/apt.conf.d/apt.conf.d/90no-recommends
/etc/apt/apt.conf.d/apt.conf.d/98labs-timeout
/etc/apt/apt.conf.d/apt.conf.d/99update-notifier
/etc/apt/preferences.d/wikimedia.pref
/etc/apt/preferences.d/preferences.d/puppet_base_2.7
/etc/apt/preferences.d/preferences.d/wikimedia.pref
```