[问题]sudo无法使用

[lingai521]

各位大虾：
小弟俺刚接触ubuntu，今天装了8.04版，我也么去修改什么文件，到后来sudo不能使用了，不知道是出了什么问题，提示如下：
>>> sudoers file: syntax error, line 12 <<<
sudo: parse error in /etc/sudoers near line 12

我该怎么去修改才能使用sudo？？？？？？？？？？？急！！！！！
希望哪位大虾指导。

[solcomo]

进入recovery mode
visudo
看看/etc/sudoers的第12句有什么问题

[Nile]

先su root

再visudo，12行语法错了

[lingai521]

recovery mode
bash: recovery：找不到命令

[solcomo]

按3楼的方法
要不还得重启

[lingai521]

:~$ su root
口令：
su：鉴定故障
victory@ares:~$ visudo
visudo: /etc/sudoers: Permission denied

[Nile]

:~$ su root
口令：
su：鉴定故障
victory@ares:~$ visudo
visudo: /etc/sudoers: Permission denied

确定你输入的是root密码

[lingai521]

但是我安装ubuntu的时候没有要设置root用户密码，不知道默认密码是多少，空的也是那样的提示

[Nile]

没辙了

重启进recovery mode吧

[delectate]

但是我安装ubuntu的时候没有要设置root用户密码，不知道默认密码是多少，空的也是那样的提示

没设置肯定鉴定错误啊

sudo passwd root

设置root密码再试试

[delectate]

先执行 su
输入口令
再gedit /etc/sudoers

我这里12行是空的，什么都没有，不知道lz你哪里有什么错误……

贴一下：

# /etc/sudoers
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the man page for details on how to write a sudoers file.
#

Defaults env_reset

# Uncomment to allow members of group sudo to not need a password
# %sudo ALL=NOPASSWD: ALL

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root ALL=(ALL) ALL

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

[lingai521]

# /etc/sudoers
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the man page for details on how to write a sudoers file.
#

Defaults env_reset

# Uncomment to allow members of group sudo to not need a password
# %sudo ALL=NOPASSWD:
ALL

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root ALL=(ALL) ALL

# Members of the admin group may gain root privileges
"/etc/sudoers.tmp" 33 lines, 797 characters


打开了，画面是这样的，请指导。

[BigSnake.NET]

修改 sudoers 文件必须用 root 身份
成为 root 有两个办法， 一个是su，需要root密码，但是默认没有设所以不能使用su。第二个办法是用sudo，但是sudo已经出故障了。

所以唯一的办法是重启进 recovery mode ， 然后用 visudo 修改 sudoers

[lingai521]

# /etc/sudoers
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the man page for details on how to write a sudoers file.
#

Defaults env_reset

# Uncomment to allow members of group sudo to not need a password
# %sudo ALL=NOPASSWD:
ALL

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root ALL=(ALL) ALL

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

# Entries for Smb4K users.
# Generated by Smb4K. Please do not modify!
User_Alias SMB4KUSERS = victory
Defaults:SMB4KUSERS env_keep += "PASSWD USER"
SMB4KUSERS ares = NOPASSWD: /usr/bin/smb4k_kill
SMB4KUSERS ares = NOPASSWD: /usr/bin/smb4k_umount
SMB4KUSERS ares = NOPASSWD: /usr/bin/smb4k_mount
# End of Smb4K user entries.
~
我要怎么样修改才可以用啊

[BigSnake.NET]

# /etc/sudoers
#
# This file MUST be edited with the 'visudo' command as root.
#
# See the man page for details on how to write a sudoers file.
#

Defaults env_reset

# Uncomment to allow members of group sudo to not need a password
# %sudo ALL=NOPASSWD:
ALL

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root ALL=(ALL) ALL

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

# Entries for Smb4K users.
# Generated by Smb4K. Please do not modify!
User_Alias SMB4KUSERS = victory
Defaults:SMB4KUSERS env_keep += "PASSWD USER"
SMB4KUSERS ares = NOPASSWD: /usr/bin/smb4k_kill
SMB4KUSERS ares = NOPASSWD: /usr/bin/smb4k_umount
SMB4KUSERS ares = NOPASSWD: /usr/bin/smb4k_mount
# End of Smb4K user entries.
~
我要怎么样修改才可以用啊

多了行 ALL