This bug was fixed in the package gnome-shell - 3.28.2-0ubuntu0.18.04.1

---------------
gnome-shell (3.28.2-0ubuntu0.18.04.1) bionic; urgency=medium

  [ Olivier Tilloy ]
  * New upstream release (LP: #1775145)
    - fixes valid password rejection at login screen (LP: #1765261)
  * Drop patches applied upstream:
    - debian/patches/polkitAgent-Guard-against-repeated-close-calls.patch
    - debian/patches/popupMenu-Fix-wrong-call-to-clutter_actor_add_child.patch
    - 
debian/patches/workspaceThumbnail-initialize-porthole-based-on-workArea.patch
    - 
debian/patches/workspaceThumbnail-only-update-_porthole-if-the-overview-.patch
    - 
debian/patches/workspaceThumbnail-rebuild-thumbnails-if-workareas-size-c.patch

  [ Andrea Azzarone ]
  * debian/patches/ubuntu_lock_on_suspend.patch: inhibit suspend until the
    screen is locked also in the case where automatic screen lock is disabled
    and screen lock on suspend is enabled (LP: #1768786)

  [ Marco Trevisan (Treviño) ]
  * Cherry pick upstream patches:
    - debian/patches/st-label-Unset-clutter-text-instance-on-disposal.patch 
(LP: #1714989)
  * debian/patches/st-texture-cache-Don-t-add-NULL-textures-to-cache.patch:
    - Cherry pick updated version from upstream, splitted in:
    + debian/patches/st-texture-cache-Don-t-add-NULL-textures-to-cache.patch
    + 
debian/patches/st-texture-cache-Save-cairo-surfaces-to-a-different-map.patch
  * 
debian/patches/authPrompt-Do-not-enable-sensitivity-if-retries-are-disal.patch
    debian/patches/authPrompt-Unset-preemptiveAnswer-on-reset.patch
    debian/patches/gdm-util-Always-allow-to-retry-login-in-unlock-mode.patch:
    - GDM gnome-shell greeter fix to fix unneeded login attempts (LP: #1777956)
  * debian/patches/series:
    - reorder to apply upstream cherry-picks before the others

  [ Daniel van Vugt ]
  * debian/patches/magnifier.js-Fix-zoom-juddering.patch:
    - magnifier.js: Fix zoom juddering (LP: #1691675)

 -- Marco Trevisan <[email protected]>  Tue, 21 Jun 2018 01:45:42 +0200

** Changed in: gnome-shell (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1777956

Title:
  Login screen reuses last written password after user selection

Status in gnome-shell package in Ubuntu:
  Fix Released
Status in gnome-shell source package in Bionic:
  Fix Released

Bug description:
  [ Impact ]

  Login could be delayed while a loging with a wrong password could be
  retried.

  See the screencast https://gitlab.gnome.org/GNOME/gnome-
  shell/uploads/9e74e74b81ef4d986a77b728e010af37/out.webm

  See upstream issue https://gitlab.gnome.org/GNOME/gnome-
  shell/issues/311

  1. Try to login up to `allowed-failures` defined with a positive value and
     using wrong password
  2. Continue writing a password as soon as the interface is sensitive again
  3. The interface will go back to user selection
  4. Select your user and gdm will try to start the authentication

  [ Test case ]

  1. Try to login using a wrong password (assuming `allowed-failures` setting 
is default)
  2. Continue writing a password as soon as the interface is sensitive again
  3. The interface will go back to user selection
  4. Select your user again
  5. The password field is active and you can properly write the password with 
no wait

  [ Regression potential ]

  Login questions which might have been already requested on more
  complex pam configurations could not be properly handled (requesting
  answers again).

  Login/Unlock retries could not be handled properly.

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