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Merge pull request #14835 from wxy/20190705-Enable-‘Tap-to-click--on-Ubuntu-Login-Screen--Quick-Tip
TSL&PRF:20190705 Enable ‘Tap to click on Ubuntu Login Screen Quick Tip
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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Enable ‘Tap to click’ on Ubuntu Login Screen [Quick Tip])
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[#]: via: (https://itsfoss.com/enable-tap-to-click-on-ubuntu-login-screen/)
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[#]: author: (Abhishek Prakash https://itsfoss.com/author/abhishek/)
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Enable ‘Tap to click’ on Ubuntu Login Screen [Quick Tip]
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======
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_**Brief: The tap to click option doesn’t work on the login screen in Ubuntu 18.04 GNOME desktop. In this tutorial, you’ll learn to enable the ‘tap to click’ on the Ubuntu login screen.**_
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One of the first few things I do after installing Ubuntu is to make sure that tap to click has been enabled. As a laptop user, I prefer to tap the touchpad for making a left click. This is more convenient than using the left click button on the touchpad all the time.
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This is what happens when I have logged in and using the operating system. But if you are at the login screen, the tap to click doesn’t work and that’s an annoyance.
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On the [GDM login screen][1] in Ubuntu (or other distributions using GNOME desktop), you have to click the username in order to bring the password field. Now if you are habitual of tap to click, it doesn’t work on the login screen even if you have it enabled and use it after logging into the system.
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This is a minor annoyance but an annoyance nonetheless. The good news is that you can fix this annoyance.Let me show you how to do that in this quick tip.
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### Enabling tap to click on Ubuntu login screen
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![][2]
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You’ll have to use the terminal and a few commands here. I hope you are comfortable with it.
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[Open a terminal using Ctrl+Alt+T shortcut in Ubuntu][3]. Since Ubuntu 18.04 is still using X server, you need to enable it to connect to the [x server][4]. For that, you can add gdm to access control list.
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Switch to root user first. It’s required because you have to switch as gdm user later and you cannot do that as a non-root user.
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```
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sudo -i
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```
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[There is no password set for root user in Ubuntu][5]. You access it with your admin user account. So when asked for password, use your own password. You won’t see anything being typed on the screen when you type in your password.
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```
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xhost +SI:localuser:gdm
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```
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Here’s the output for me:
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```
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xhost +SI:localuser:gdm
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localuser:gdm being added to access control list
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```
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Now run this command so that the the ‘user gdm’ has the correct tap to click setting.
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```
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gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click true
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```
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If you see a warning like this: (process:6339): dconf-WARNING **: 19:52:21.217: Unable to open /root/.local/share/flatpak/exports/share/dconf/profile/user: Permission denied . Don’t worry. Just ignore it.
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[][6]
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Suggested read How To Change Hostname on Ubuntu & Other Linux Distributions
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This will enable you to perform a tap to click on the login screen. Why were you not able to use tap to click when you made the changes in the system settings before? It’s because at the login screen, you haven’t selected your username yet. You get to use your account only when you select the user on the screen. This is why you had to use the user gdm and add the correct settings with it.
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Restart Ubuntu and you’ll see that you can now use the tap to select your user account now.
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#### Revert the changes
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If you are not happy with the tap to click on the Ubuntu login screen for some reason, you can revert the changes.
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You’ll have to perform all the steps you did in the previous section: switch to root, connect gdm with x server, switch to gdm user. But instead of the last command, you need to run this command:
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```
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gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click false
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```
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That’s it.
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As I said, it’s a tiny thing. I mean you can easily do a left click instead of the tap to click. It’s just a matter of one single click.However, it breaks the ‘continuity’ when you are forced to use the left click after a few taps.
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I hope you liked this quick little tweak. If you know some other cool tweaks, do share it with us.
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/enable-tap-to-click-on-ubuntu-login-screen/
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作者：[Abhishek Prakash][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://itsfoss.com/author/abhishek/
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[b]: https://github.com/lujun9972
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[1]: https://wiki.archlinux.org/index.php/GDM
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[2]: https://i2.wp.com/itsfoss.com/wp-content/uploads/2019/07/tap-to-click-on-ubuntu-login.jpg?ssl=1
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[3]: https://itsfoss.com/ubuntu-shortcuts/
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[4]: https://en.wikipedia.org/wiki/X.Org_Server
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[5]: https://itsfoss.com/change-password-ubuntu/
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[6]: https://itsfoss.com/change-hostname-ubuntu/
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@ -0,0 +1,98 @@
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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: (wxy)
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Enable ‘Tap to click’ on Ubuntu Login Screen [Quick Tip])
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[#]: via: (https://itsfoss.com/enable-tap-to-click-on-ubuntu-login-screen/)
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[#]: author: (Abhishek Prakash https://itsfoss.com/author/abhishek/)
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如何在 Ubuntu 登录屏幕上启用轻击
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======
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> <ruby>轻击<rt>tap to click</rt></ruby>选项在 Ubuntu 18.04 GNOME 桌面的登录屏幕上不起作用。在本教程中，你将学习如何在 Ubuntu 登录屏幕上启用“轻击”。
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安装 Ubuntu 后我做的第一件事就是确保启用了轻击功能。作为笔记本电脑用户，我更喜欢轻击触摸板进行左键单击。这比使用触摸板上的左键单击按钮更方便。
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我登录并使用操作系统时可以轻击。但是，如果你在登录屏幕上，轻击不起作用，这是一个烦恼。
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在 Ubuntu（或使用 GNOME 桌面的其他发行版）的 [GDM 登录屏幕][1]上，你必须单击用户名才能显示密码字段。现在，如果你习惯了轻击，即使你已启用了它并在登录系统后可以使用，它也无法在登录屏幕上运行。
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这是一个轻微的烦恼，但仍然是一个烦恼。好消息是你可以解决这个烦恼。让我告诉你如何在这个快速提示中做到这一点。
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### 在 Ubuntu 登录屏幕上启用轻击
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![][2]
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你必须在这里使用终端和一些命令。我希望你能够适应。
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[在 Ubuntu 中使用 Ctrl + Alt + T 快捷键打开终端][3]。由于 Ubuntu 18.04 仍在使用 X 显示服务器，因此需要启用它才能连接到 [X 服务器][4]。为此，你可以将 `gdm` 添加到访问控制列表中。
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首先切换到 `root` 用户。这是必需的，因为你必须稍后切换为 `gdm` 用户，而不能以非 `root` 用户身份执行此操作。
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```
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sudo -i
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```
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[在 Ubuntu 中没有为 root 用户设置密码][5]。你可以使用管理员用户帐户访问它。因此，当要求输入密码时，请使用你自己的密码。输入密码时，屏幕上不会显示任何输入内容。
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```
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xhost +SI:localuser:gdm
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```
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这是我的输出：
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```
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xhost +SI:localuser:gdm
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localuser:gdm being added to access control list
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```
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现在运行此命令，以便 `gdm` 用户具有正确的轻击设置。
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```
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gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click true
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```
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如果你看到这样的警告：`(process:6339): dconf-WARNING **: 19:52:21.217: Unable to open /root/.local/share/flatpak/exports/share/dconf/profile/user: Permission denied`。别担心。忽略它就行。
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[][6]
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这将使你能够轻击登录屏幕。为什么在系统设置中进行更改之前无法使用轻击？这是因为在登录屏幕上，你还没有选择用户名。只有在屏幕上选择用户时才能使用你的帐户。这就是你必须使用用户 `gdm` 并使用它添加正确设置的原因。
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重新启动 Ubuntu，你会看到现在可以使用轻击来选择你的用户帐户。
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#### 还原改变
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如果你因为某些原因不喜欢在 Ubuntu 登录界面轻击，可以还原更改。
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你必须执行上一节中的所有步骤：切换到 `root`，将 `gdm` 与 X 服务器连接，切换到 `gdm` 用户。但是，你需要运行此命令，而不是上一个命令：
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```
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gsettings set org.gnome.desktop.peripherals.touchpad tap-to-click false
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```
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就是这样。
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正如我所说，这是一件小事。我的意思是你可以轻松地点击左键而不是轻击。这只是一次单击的问题。但是，当你在几次轻击后被迫使用左键单击时，它会打破操作“连续性”。
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我希望你喜欢这个快速的小调整。如果你知道其他一些很酷的调整，请与我们分享。
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/enable-tap-to-click-on-ubuntu-login-screen/
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作者：[Abhishek Prakash][a]
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选题：[lujun9972][b]
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译者：[wxy](https://github.com/wxy)
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校对：[wxy](https://github.com/wxy)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://itsfoss.com/author/abhishek/
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[b]: https://github.com/lujun9972
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[1]: https://wiki.archlinux.org/index.php/GDM
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[2]: https://i2.wp.com/itsfoss.com/wp-content/uploads/2019/07/tap-to-click-on-ubuntu-login.jpg?ssl=1
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[3]: https://itsfoss.com/ubuntu-shortcuts/
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[4]: https://en.wikipedia.org/wiki/X.Org_Server
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[5]: https://itsfoss.com/change-password-ubuntu/
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[6]: https://itsfoss.com/change-hostname-ubuntu/
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