Stop recommending usage of sudo pip in installation documentation

[nanonyme]

Please suggest users to use pip --user instead of sudo pip to install virtualenv in https://virtualenv.pypa.io/en/stable/installation/ ; latter can break the system completely and runs setup.py from PyPI as root when pip doesn't support wheels

[altendky]

Could also provide a list of system packages for various distributions.

• Ubuntu
  • https://packages.ubuntu.com/artful/virtualenv
  • https://packages.ubuntu.com/artful/python-virtualenv
  • https://packages.ubuntu.com/artful/python3-virtualenv
• Debian
  • https://packages.debian.org/stretch/virtualenv
  • https://packages.debian.org/stretch/python-virtualenv
  • https://packages.debian.org/stretch/python3-virtualenv
• Fedora
  • https://apps.fedoraproject.org/packages/python-virtualenv
  • https://apps.fedoraproject.org/packages/python3-virtualenv
• Arch
  • https://www.archlinux.org/packages/extra/any/python2-virtualenv/
  • https://www.archlinux.org/packages/extra/any/python-virtualenv/
• SUSE
  • https://software.opensuse.org/package/python-virtualenv
  • https://software.opensuse.org/package/python3-virtualenv

Pretty easy to guess but... And yes, I do realize that you don't need to match the virtualenv Python version to your target. Just providing all links.

[stale]

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[nanonyme]

Won't fix? Really?

[pfmoore]

@nanonyme I agree, we shouldn't be recommending sudo. Can you provide a PR? Note that I do not think we should try to offer system-specific install commands, that's not the role of the virtualenv documentation.