The solution for ordinary users not being able to use the sudo command
https://www.cnblogs.com/fasthorse/p/5949946.html
1. Switch to the root user: su – root
2. Add write permission to the /etc/sudoers file: chmod u+w /etc/sudoers
3. Add permission to use sudu to ordinary users:
vim /etc/sudoers
Find this line: root ALL=(ALL) ALL, add xxx ALL=(ALL) ALL below this line (xxx here is your normal user)
##Explain here, add the format of the sudo command that ordinary users can use under sudoers:
xxx ALL=(ALL) ALL ##: Ordinary users can use the sudo command, but a password is required
%xxx ALL=(ALL) ALL ##Users in user group xxx can use the sudo command, but a password is required
xxx ALL=(ALL) NOPASSWD:ALL ##Ordinary users can use sudo command without password
%xxx ALL=(ALL) NOPASSWD:ALL ##Users in user group xxx can use sudo command without password
4. After adding, save and exit
5. Remove the root user's write permission to the sudoers file: chmod uw /etc/sudoers
解决sudo: sorry, you must have a tty to run sudo
https://blog.csdn.net/breezehappy/article/details/38895375