E: Unable to locate package vim code example

Example 1: E: Unable to locate package npm

curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
sudo apt-get install -y nodejs

Example 2: E: Unable to locate package rvm

wget http://archive.ubuntu.com/ubuntu/pool/universe/r/ruby-rvm/ruby-rvm_1.6.9-0ubuntu2.dsc http://archive.ubuntu.com/ubuntu/pool/universe/r/ruby-rvm/ruby-rvm_1.6.9.orig.tar.gz http://archive.ubuntu.com/ubuntu/pool/universe/r/ruby-rvm/ruby-rvm_1.6.9-0ubuntu2.debian.tar.gz
sudo apt-get install build-essential fakeroot debhelper ruby
dpkg-source -x ruby-rvm_1.6.9-0ubuntu2.dsc
cd ruby-rvm*
dpkg-buildpackage -rfakeroot -b -nc -us -uc
cd ..
apt-get install adduser bison curl file git libreadline5-dev libsqlite3-dev libxml2-dev zlib1g-dev
dpkg -i ruby-rvm_1.6.9-0ubuntu2_*.deb