方法一：
sudo usermod -aG admin username
方法二：
sudo cat /etc/sudoers # /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
# Host alias specification
# User alias specification
# Cmnd alias specification
# User privilege specificationroot ALL=(ALL) ALL#qjt ALL=(ALL) ALL#lyh ALL=(ALL) ALLzkl ALL=(ALL) NOPASSWD: ALL
# Uncomment to allow members of group sudo to not need a password# (Note that later entries override this, so you might need to move# it further down)# %sudo ALL=NOPASSWD: ALL
# Members of the admin group may gain root privileges
