Sorry but "/etc/apt/apt.conf" not found
result of "ls /etc/apt/" :
apt.conf.d secring.gpg sources.list.d trustdb.gpg trusted.gpg~ preferences.d sources.list sources.list.save trusted.gpg
result for "/etc/apt/apt.conf.d":
00trustcdrom 05aptitude 20archive 70debconf 01autoremove 10periodic 20dbus 99update-notifier 01ubuntu 15update-stamp 50unattended-upgrades
Sorry but "/etc/apt/apt.conf" not found
result of "ls /etc/apt/" :
apt.conf.d secring.gpg sources.list.d trustdb.gpg trusted.gpg~
preferences.d sources.list sources.list.save trusted.gpg
result for "/etc/apt/ apt.conf. d":
00trustcdrom 05aptitude 20archive 70debconf upgrades
01autoremove 10periodic 20dbus 99update-notifier
01ubuntu 15update-stamp 50unattended-