当我从 Mac 登录到 Ubuntu 时，我看到一个奇怪的警告“ Unable to get valid context for <user>”。我不记得这是什么时候开始的，也不记得是什么变化导致了这种情况。到目前为止，我还没有遇到任何不良影响，我只是不确定为什么现在会出现这个消息。
Welcome to Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-104-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
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0 updates are security updates.
Unable to get valid context for meanwhileinhell
Last login: Tue Dec 19 10:31:44 2017 from 192.168.2.1
/var/log/auth.log
sshd[6147]: Accepted publickey for meanwhileinhell from 192.168.2.1 port 57194 ssh2: RSA SHA256:<key>
sshd[6147]: pam_unix(sshd:session): session opened for user meanwhileinhell by (uid=0)
systemd-logind[780]: New session 6 of user meanwhileinhell.
sshd[6147]: pam_selinux(sshd:session): Unable to get valid context for meanwhileinhell
sshd[6177]: error: ssh_selinux_getctxbyname: Failed to get default SELinux security context for meanwhileinhell
sshd[6147]: error: ssh_selinux_getctxbyname: Failed to get default SELinux security context for meanwhileinhell
sshd[6147]: error: ssh_selinux_setup_pty: security_compute_relabel: Invalid argument
$ sestatus -v
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: ubuntu
Current mode: permissive
Mode from config file: permissive
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 30
Process contexts:
Current context: system_u:system_r:kernel_t:s0
Init context: system_u:system_r:kernel_t:s0
File contexts:
Controlling terminal: system_u:object_r:devpts_t:s0
/etc/passwd system_u:object_r:file_t:s0
/etc/shadow system_u:object_r:file_t:s0
/bin/bash system_u:object_r:file_t:s0
/bin/login system_u:object_r:file_t:s0
/bin/sh system_u:object_r:file_t:s0 ->
system_u:object_r:file_t:s0
/sbin/agetty system_u:object_r:file_t:s0
/sbin/init system_u:object_r:file_t:s0 ->
system_u:object_r:file_t:s0
/usr/sbin/sshd system_u:object_r:file_t:s0
我对 SELinux 了解甚少，所以不太愿意继续运行未知命令，但如果有人能帮助我理解这意味着什么，我将非常感激。我发现了这个问题Linux 控制台：“无法获取有效上下文...”但它没有提供任何有用的东西。
$ semanage login -l
ValueError: SELinux policy is not managed or store cannot be accessed.
答案1
$ semanage login -l
这会失败，因为您需要以 root 身份执行此操作。当我使用“sudo”时，它会起作用。我不知道这是否能让您更接近答案；我在尝试找出如何解决这个问题时偶然发现了您的问题！