ubuntu出現如下錯誤：
{
Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.15.0-42-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
77 packages can be updated.
0 updates are security updates.
*** System restart required ***
Last login: Fri Dec 7 13:59:33 2018 from 10.12.21.2
-bash: ls: No such file or directory
-bash: lesspipe: No such file or directory
-bash: dircolors: No such file or directory
-bash: ls: No such file or directory
carrie@carrie-MMLP7AP-V7:~$ sudo su -l
Command 'sudo' is available in '/usr/bin/sudo'
The command could not be located because '/usr/bin' is not included in the PATH environment variable.
sudo: command not found
}
原因是：
默認的環境變量錯誤，
#cat /etc/profile
export PATH=
修改錯誤:
# export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin
# reboot
重啟機器，登陸OK。
---------------------
作者：IT界的佛系少女
來源：CSDN
原文：https://blog.csdn.net/qq_38693296/article/details/84935566
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