每次我使用 sudo 命令时，它都会显示“>>> /etc/sudoers.d/90-cloudimg-ubuntu：第 1 行附近的语法错误<<<”

Question

使用sudo apt-get update命令时出现以下错误。

>>> /etc/sudoers.d/90-cloudimg-ubuntu: syntax error near line 1 <<<
sudo: parse error in /etc/sudoers.d/90-cloudimg-ubuntu near line 1
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin

看截图

我试图找到一个解决方案，文件末尾已经

#includedir /etc/sudoers.d

您可以在此屏幕截图中查看输出pkexec visudo

您可以查看文件 etc/sudoers：

s file MUST be edited with the 'visudo' command as root.

#

Please consider adding local content in /etc/sudoers.d/ instead of

directly modifying this file.

#

See the man page for details on how to write a sudoers file.

# Defaults env_reset Defaults mail_badpass Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

Host alias specification

User alias specification

Cmnd alias specification

User privilege specification

root ALL=(ALL:ALL) ALL

Members of the admin group may gain root privileges

%admin ALL=(ALL) ALL

Allow members of group sudo to execute any command

%sudo ALL=(ALL:ALL) ALL

See sudoers(5) for more information on "#include" directives:

includedir /etc/sudoers.d

和文件 etc/sudoers.d/README

#
# As of Debian version 1.7.2p1-1, the default /etc/sudoers file created on
# installation of the package now includes the directive:
# 
#   #includedir /etc/sudoers.d
# 
# This will cause sudo to read and parse any files in the /etc/sudoers.d 
# directory that do not end in '~' or contain a '.' character.
# 
# Note that there must be at least one file in the sudoers.d directory (this
# one will do), and all files in this directory should be mode 0440.
# 
# Note also, that because sudoers contents can vary widely, no attempt is 
# made to add this directive to existing sudoers files on upgrade.  Feel free
# to add the above directive to the end of your /etc/sudoers file to enable 
# this functionality for existing installations if you wish!
#
# Finally, please note that using the visudo command is the recommended way
# to update sudoers content, since it protects against many failure modes.
# See the man page for visudo for more information.
#

和输出pkexec cat /etc/sudoers.d/90-cloudimg-ubuntu：

$(user) ALL=(ALL) NOPASSWD:ALL

编辑：现在我收到以下错误-

我想要一个具体而准确的答案。我是 Ubuntu (14.04) 的新手，请帮助我！

Answer 1

首先，永远不要/etc/sudoers手动编辑，总是使用visudo. 您的问题是文件中的语法错误，/etc/sudoers.d/90-cloudimg-ubuntu但现在是格式错误的/etc/sudoers.

因此，要修复它（现在您已经删除了您可能所做的任何更改），请运行pkexec visudo并使文件如下所示：

#
# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

    # Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

# See sudoers(5) for more information on "#include" directives:

#includedir /etc/sudoers.d

保存文件 ( Ctrl+ O) 并退出 ( Ctrl+ X)。接下来，我建议您将其移动到/etc/sudoers.d/90-cloudimg-ubuntu其他地方，以免引起问题：

pkexec mv /etc/sudoers.d/90-cloudimg-ubuntu ~/

此时，您应该有一个可以工作的sudo. 如果需要该90-cloudimg-ubuntu文件，请提出有关该文件内容的新问题，我们可以帮助您将其放回原处并修复错误。