[Bug 1475094] Re: Warning because an already existing user is tried to be created

[WinEunuchs2Unix]

Noticed this error for the first time today running `sudo apt upgrade`.
Also for the first time (single user account laptop) had to sign on to
console (ctrl+alt+F1) and (ctrl+alt+f2) because Ubuntu 16.04 login
screen wasn't working due to activating Nvidia 367.44 driver in
`Additional Drivers` screen.

Signing into console was necessary for the first time ever in order to
restore Intel integrated graphics and using the system normally.

(Kernel version 4.7.5)

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https://bugs.launchpad.net/bugs/1475094

Title:
  Warning because an already existing user is tried to be created

Status in adduser package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  Triaged
Status in adduser package in Debian:
  New

Bug description:
  I'm using Ubuntu 15.10 dev with systemd/udev 222-1ubuntu4 and on the
  last upgrades I have noticed that these packages are trying to create
  users which already exists. On reinstalling them udev shows on setting
  up "addgroup: The group `input' already exists as a system group.
  Exiting." and systemd shows on setting up "addgroup: The group
  `systemd-journal' already exists as a system group. Exiting." and
  "addgroup: The group `systemd-journal-remote' already exists as a
  system group. Exiting.". Maybe it could be checked if a user exists to
  avoid showing a warning.

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