[Bug 1637773] [NEW] update replaced custom setting in sudoers, despite showing "no changes"

[tsg1zzn]

Public bug reported:

I have Ubuntu Studio 14.04. I used software updater to update. I then
got a box asking me to replace /etc/sudoers. There was an expandable
called "changes", which I clicked on. This revealed an _empty_ text
area.

Just in case, I backed up my sudoers file. Then I went ahead and allowed
the replace of this file.

Now it turns out there were changes. My custom setting was removed:
Defaults    timestamp_timeout=0

Also, the path line was updated with an added /snap/bin.

It shouldn't show no changes when there are changes. I'm not sure if
this is a problem with the sudo package or the updater.

** Affects: sudo (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1637773

Title:
  update replaced custom setting in sudoers, despite showing "no
  changes"

Status in sudo package in Ubuntu:
  New

Bug description:
  I have Ubuntu Studio 14.04. I used software updater to update. I then
  got a box asking me to replace /etc/sudoers. There was an expandable
  called "changes", which I clicked on. This revealed an _empty_ text
  area.

  Just in case, I backed up my sudoers file. Then I went ahead and
  allowed the replace of this file.

  Now it turns out there were changes. My custom setting was removed:
  Defaults    timestamp_timeout=0

  Also, the path line was updated with an added /snap/bin.

  It shouldn't show no changes when there are changes. I'm not sure if
  this is a problem with the sudo package or the updater.

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