Just to confirm I can reproduce this 100% reliably in 18.10 and in Disco, as 
follows.
Open Software & Updates and switch to the Other Software tab and click one of 
the checkboxes the window loses focus but the authentication dialog does not 
appear (I have checked it is not under another window). If however I click a 
checkbox on the Ubuntu Software tab then the authentication dialog does appear.

** Tags added: disco

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1734095

Title:
  Software & Updates not showing authorization popup [gnome-shell[N]:
  pushModal: invocation of begin_modal failed]

Status in GNOME Shell:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to Ubuntu 17.10 (from 17.04), if I open the Software
  and Updates app and attempt to change anything it does not popup the
  authorization dialog and will not let changes through.  In sylog I see

  Nov 23 10:07:04 tigger gnome-shell[2142]: polkitAuthenticationAgent: Received 
3 identities that can be used for authentication. Only considering one.
  Nov 23 10:07:04 tigger gnome-shell[2142]: pushModal: invocation of 
begin_modal failed
  Nov 23 10:07:04 tigger gnome-shell[2142]: polkitAuthenticationAgent: Failed 
to show modal dialog. Dismissing authentication request for action-id 
com.ubuntu.softwareproperties.applychanges cookie 
1-28e9d285258e7cd70c2af2980886a55b-1-cff4894642cc4a6c033597370ee1f740
  Nov 23 10:07:04 tigger software-properties-gnome.desktop[3367]: 
ERROR:root:Authentication canceled, changes have not been saved

  Before the upgrade it was ok.
  Other apps that require authorisation function as expected.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.1-0ubuntu5
  ProcVersionSignature: Ubuntu 4.13.0-17.20-generic 4.13.8
  Uname: Linux 4.13.0-17-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Nov 23 10:07:44 2017
  DisplayManager: lightdm
  InstallationDate: Installed on 2014-10-21 (1128 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20141017)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to artful on 2017-11-22 (0 days ago)

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