“sudo dmidecode”->“/dev/mem：操作不允许”

Question

运行“sudo dmidecode”时我得到以下输出：

johnny@johns-laptop:~$ sudo dmidecode
# dmidecode 2.12
# SMBIOS entry point at 0xa9e84010
/dev/mem: Operation not permitted
johnny@johns-laptop:~$ 

搜索该主题仅会产生请求者想要以非 root 身份访问 /dev/mem 的线程，或者尝试执行比这更复杂的事情的线程。

背景是 - 大约 2 个月前，我的桌面在软件更新后根本无法启动，我通过创建另一个用户并复制文件解决了这个问题。所以当我用 root 权限设置新用户名时，可能我做得不够彻底...

我认为我的经验水平是菜鸟级的。

sudoers 文件...

#
# 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


johnny@johns-laptop:~$ ls -l /dev/mem
crw-r----- 1 root kmem 1, 1 Dec 20 09:22 /dev/mem
johnny@johns-laptop:~$ lsattr /dev/mem
lsattr: Operation not supported While reading flags on /dev/mem
johnny@johns-laptop:~$ ^C
johnny@johns-laptop:~$