Установка pip3

Я следовал инструкциям здесь для установки pip3; мне нужен он для установки других python3 пакетов. Я не помню, установил ли я pip3 долгое время прежде. После выполнения sudo apt install python3-pip, Я получаю следующее как вывод,

Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3-pip is already the newest version (8.1.1-2ubuntu0.4).
The following packages were automatically installed and are no longer required:
  gyp libavdevice-ffmpeg56 libjs-inherits libjs-node-uuid libuv1-dev
  linux-headers-4.13.0-37 linux-headers-4.13.0-37-generic
  linux-headers-4.13.0-38 linux-headers-4.13.0-38-generic
  linux-headers-4.13.0-39 linux-headers-4.13.0-39-generic
  linux-headers-4.13.0-41 linux-headers-4.13.0-41-generic
  linux-headers-4.13.0-43 linux-headers-4.13.0-43-generic
  linux-headers-4.13.0-45 linux-headers-4.13.0-45-generic
  linux-headers-4.15.0-29 linux-headers-4.15.0-29-generic
  linux-image-4.13.0-37-generic linux-image-4.13.0-38-generic
  linux-image-4.13.0-39-generic linux-image-4.13.0-41-generic
  linux-image-4.13.0-43-generic linux-image-4.13.0-45-generic
  linux-image-4.15.0-29-generic linux-image-extra-4.13.0-37-generic
  linux-image-extra-4.13.0-38-generic linux-image-extra-4.13.0-39-generic
  linux-image-extra-4.13.0-41-generic linux-image-extra-4.13.0-43-generic
  linux-image-extra-4.13.0-45-generic linux-modules-4.15.0-29-generic
  linux-modules-extra-4.15.0-30-generic linux-signed-image-4.13.0-37-generic
  linux-signed-image-4.13.0-38-generic linux-signed-image-4.13.0-39-generic
  linux-signed-image-4.13.0-41-generic linux-signed-image-4.13.0-43-generic
  linux-signed-image-4.13.0-45-generic
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 236 not upgraded.

Однако, Когда я ввожу which pip3, Я не получаю вывода. Снова, Когда я ввел pip3 -V, Я получаю следующий ответ:

The program 'pip3' is currently not installed. You can install it by typing:
sudo apt install python3-pip

Я попробовал dpkg -L python3-pip и получил следующее как вывод:

/.
/usr
/usr/lib
/usr/lib/python3
/usr/lib/python3/dist-packages
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info/PKG-INFO
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info/dependency_links.txt
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info/not-zip-safe
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info/requires.txt
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info/entry_points.txt
/usr/lib/python3/dist-packages/pip-8.1.1.egg-info/top_level.txt
/usr/lib/python3/dist-packages/pip
/usr/lib/python3/dist-packages/pip/baseparser.py
/usr/lib/python3/dist-packages/pip/__main__.py
/usr/lib/python3/dist-packages/pip/req
/usr/lib/python3/dist-packages/pip/req/req_set.py
/usr/lib/python3/dist-packages/pip/req/req_install.py
/usr/lib/python3/dist-packages/pip/req/__init__.py
/usr/lib/python3/dist-packages/pip/req/req_file.py
/usr/lib/python3/dist-packages/pip/req/req_uninstall.py
/usr/lib/python3/dist-packages/pip/index.py
/usr/lib/python3/dist-packages/pip/status_codes.py
/usr/lib/python3/dist-packages/pip/utils
/usr/lib/python3/dist-packages/pip/utils/setuptools_build.py
/usr/lib/python3/dist-packages/pip/utils/appdirs.py
/usr/lib/python3/dist-packages/pip/utils/outdated.py
/usr/lib/python3/dist-packages/pip/utils/ui.py
/usr/lib/python3/dist-packages/pip/utils/logging.py
/usr/lib/python3/dist-packages/pip/utils/encoding.py
/usr/lib/python3/dist-packages/pip/utils/deprecation.py
/usr/lib/python3/dist-packages/pip/utils/__init__.py
/usr/lib/python3/dist-packages/pip/utils/filesystem.py
/usr/lib/python3/dist-packages/pip/utils/hashes.py
/usr/lib/python3/dist-packages/pip/utils/build.py
/usr/lib/python3/dist-packages/pip/compat
/usr/lib/python3/dist-packages/pip/compat/dictconfig.py
/usr/lib/python3/dist-packages/pip/compat/__init__.py
/usr/lib/python3/dist-packages/pip/compat/ordereddict.py
/usr/lib/python3/dist-packages/pip/models
/usr/lib/python3/dist-packages/pip/models/index.py
/usr/lib/python3/dist-packages/pip/models/__init__.py
/usr/lib/python3/dist-packages/pip/vcs
/usr/lib/python3/dist-packages/pip/vcs/bazaar.py
/usr/lib/python3/dist-packages/pip/vcs/subversion.py
/usr/lib/python3/dist-packages/pip/vcs/mercurial.py
/usr/lib/python3/dist-packages/pip/vcs/__init__.py
/usr/lib/python3/dist-packages/pip/vcs/git.py
/usr/lib/python3/dist-packages/pip/cmdoptions.py
/usr/lib/python3/dist-packages/pip/basecommand.py
/usr/lib/python3/dist-packages/pip/commands
/usr/lib/python3/dist-packages/pip/commands/completion.py
/usr/lib/python3/dist-packages/pip/commands/install.py
/usr/lib/python3/dist-packages/pip/commands/hash.py
/usr/lib/python3/dist-packages/pip/commands/uninstall.py
/usr/lib/python3/dist-packages/pip/commands/__init__.py
/usr/lib/python3/dist-packages/pip/commands/list.py
/usr/lib/python3/dist-packages/pip/commands/search.py
/usr/lib/python3/dist-packages/pip/commands/show.py
/usr/lib/python3/dist-packages/pip/commands/download.py
/usr/lib/python3/dist-packages/pip/commands/wheel.py
/usr/lib/python3/dist-packages/pip/commands/freeze.py
/usr/lib/python3/dist-packages/pip/commands/help.py
/usr/lib/python3/dist-packages/pip/_vendor
/usr/lib/python3/dist-packages/pip/_vendor/__init__.py
/usr/lib/python3/dist-packages/pip/operations
/usr/lib/python3/dist-packages/pip/operations/__init__.py
/usr/lib/python3/dist-packages/pip/operations/freeze.py
/usr/lib/python3/dist-packages/pip/__init__.py
/usr/lib/python3/dist-packages/pip/locations.py
/usr/lib/python3/dist-packages/pip/pep425tags.py
/usr/lib/python3/dist-packages/pip/exceptions.py
/usr/lib/python3/dist-packages/pip/download.py
/usr/lib/python3/dist-packages/pip/wheel.py
/usr/share
/usr/share/man
/usr/share/man/man1
/usr/share/man/man1/pip3.1.gz
/usr/share/doc
/usr/share/doc/python3-pip
/usr/share/doc/python3-pip/copyright
/usr/bin
/usr/bin/pip3
/usr/share/doc/python3-pip/changelog.Debian.gz

который подразумевает, что pip3 был установлен.

Как я решаю этот вопрос?

Еще некоторые детали: Мне установили python 2.7 и python 3 в/usr/local/lib/. python 2.7 имеет следующие установки зернышка:

/usr/local/lib/python2.7/dist-packages/pip
/usr/local/lib/python2.7/dist-packages/pip-10.0.0.dist-info
/usr/local/lib/python2.7/dist-packages/pip-18.0.dist-info

в то время как существует установка № pip3 в/usr/local/lib/python3.5/. В python3 существует только установка зернышка.

Как я решаю этот вопрос?