I have a new out of the box Dell Precision tower 3620 that came with ubuntu 14 installed. I tried to use apt-get to install openssh-server and rcs, got message "Unable to locate package". Obviously these packages have to exist, I have other ubuntu boxes that have these installed. Somehow the default config of apt-get on this dell is different from the default config when I install ubuntu myself. I never tweak the config of apt-get, so I have no idea how to fix. Any clues?

# apt-get -y install rcs
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package rcs

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty

# ls /etc/apt/
apt.conf.d/ sources.list sources.list.d/ trustdb.gpg trusted.gpg.d/
preferences.d/ sources.list~ sources.list.orig trusted.gpg
# ls /etc/apt/preferences.d/
# ls /etc/apt/apt.conf.d/
00aptitude 01autoremove-kernels 20archive 50unattended-upgrades
00trustcdrom 10periodic 20changelog 70debconf
01autoremove 15update-stamp 20dbus 99update-notifier
# cat /etc/apt/sources.list

# ls /etc/apt/sources.list.
sources.list.d/ sources.list.orig
# ls /etc/apt/sources.list.d
trusty-dell.list trusty-dell-ws-vivid-skl.list trusty-oem.list trusty-oem-sp1.list
# cat /etc/apt/sources.list.d/*
deb dell.archive.canonical.com/updates trusty-dell public
deb-src dell.archive.canonical.com/updates trusty-dell public
deb dell.archive.canonical.com/updates trusty-dell-ws-vivid-skl public
deb-src dell.archive.canonical.com/updates trusty-dell-ws-vivid-skl public
deb oem.archive.canonical.com/updates trusty-oem public
deb-src oem.archive.canonical.com/updates trusty-oem public
deb oem.archive.canonical.com/updates trusty-oem-sp1 public
deb-src oem.archive.canonical.com/updates trusty-oem-sp1 public