Public bug reported:

When Gnome Shell crashes or after boot, GDM is shown and asks the user
to select an account and type the password. However selecting the
account by tapping on it with the trackpad does not work. One has to
press hard on the trackpad until it makes a cracking noise.

This is probably because the defaults in the input manager for GDM and
new user accounts are set to disable "tap to click".

1. The default is inconsistent for users who have this enabled within
their account, but unexpectedly encounter the default before logging in.

2. The default (for session login etc.) should be all-encompassing
rather than specialized/restrictive. A user being used to click is not
hindered by tapping being enabled. A user being used to tap is however
hindered by tapping being disabled.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: gdm3 3.24.1-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.10.0-30.34-generic 4.10.17
Uname: Linux 4.10.0-30-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Aug  5 14:12:39 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-11-05 (273 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] 
failed with exit code 1: Hint: You are currently not seeing messages from other 
users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
 PATH=(custom, no user)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug third-party-packages zesty

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  Trackpad tap does not work in GDM

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