I've also tried a bionic azure image 
$ cat /etc/cloud/build.info 
build_name: server
serial: 20180222

It did not reproduce there.
So as far as I can tell it shows itself only on Azure 16.04 images.


** Also affects: cloud-images
   Importance: Undecided
       Status: New

** Changed in: cloud-images
       Status: New => Confirmed

** Changed in: cloud-images
   Importance: Undecided => Medium

** Changed in: cloud-images
   Importance: Medium => Low

** Description changed:

+ On 16.04 images on Azure,
  adduser and deluser are now printing to stderr 'sent invalidate(passwd)' and
  'sent invalidate(group)'.
  
- These are confusing at best and new in bionic.
+ These are confusing at best.
  See below. They do not seem harmful, but not wonderful.
  
+ I only see them on images of 16.04 on Azure.  I cannot reproduce in
+ 16.04 or 18.04 images on LXD, Openstack.  I cannot reproduce in 18.04
+ on Azure.
  
  smoser@ubuntu1:~$ sudo adduser guest
  Adding user `guest' ...
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Adding new group `guest' (1001) ...
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Adding new user `guest' (1001) with group `guest' ...
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  The home directory `/home/guest' already exists.  Not copying from 
`/etc/skel'.
- Enter new UNIX password: 
- Retype new UNIX password: 
+ Enter new UNIX password:
+ Retype new UNIX password:
  passwd: password updated successfully
  Changing the user information for guest
  Enter the new value, or press ENTER for the default
-         Full Name []: Foo Bar
-         Room Number []: 
-         Work Phone []: 
-         Home Phone []: 
-         Other []: 
+         Full Name []: Foo Bar
+         Room Number []:
+         Work Phone []:
+         Home Phone []:
+         Other []:
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
- Is the information correct? [Y/n] 
+ Is the information correct? [Y/n]
  smoser@ubuntu1:~$ sudo deluser guest
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Removing user `guest' ...
  Warning: group `guest' has no more members.
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  sent invalidate(passwd) request, exiting
  sent invalidate(group) request, exiting
  Done.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: adduser 3.113+nmu3ubuntu4
  ProcVersionSignature: User Name 4.13.0-1007.9-azure 4.13.13
  Uname: Linux 4.13.0-1007-azure x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Fri Feb 16 19:30:12 2018
  PackageArchitecture: all
  ProcEnviron:
-  TERM=screen
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=screen
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  SourcePackage: adduser
  UpgradeStatus: No upgrade log present (probably fresh install)

** Also affects: cloud-images/x-series
   Importance: Undecided
       Status: New

** Changed in: cloud-images/x-series
       Status: New => Confirmed

** Changed in: cloud-images/x-series
   Importance: Undecided => Low

** Changed in: cloud-images
       Status: Confirmed => Invalid

** No longer affects: adduser (Ubuntu)

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https://bugs.launchpad.net/bugs/1750031

Title:
  scary/unexpected output in adduser and deluser

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