odroid@odroid:~$ sudo apt install tasksel
[sudo] password for odroid:
odroid is not in the sudoers file.  This incident will be reported. 

root@odroid:~# sudo vi /etc/sudoers

# 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:/snap/bin"

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL
odroid  ALL=(ALL:ALL) ALL