user is not in the sudoers file. This incident will be reported.

kuzia@mobile ~ $ sudo apt-get 123123
[sudo] password for kuzia: 
kuzia is not in the sudoers file.  This incident will be reported.
kuzia@mobile ~ $ su
������: 
mobile kuzia # /etc/sudoers
bash: /etc/sudoers: �������� � �������
mobile kuzia # 
 

kuzia@mobile ~ $ id
uid=1000(kuzia) gid=1000(kuzia) ������=1000(kuzia),4(adm),20(dialout),21(fax),24(cdrom),25(floppy),26(tape),29(audio),30(dip),44(video),46(plugdev),104(fuse),107(scanner),109(lpadmin),112(nopasswdlogin),113(netdev),126(powerdev),127(sambashare)
 

#
# 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	secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 
# Host alias specification
 
# User alias specification
 
# Cmnd alias specification
 
# User privilege specification
root	ALL=(ALL:ALL) ALL
 
# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL
 
# Allow members of group sudo to execute any command
%sudo	ALL=(ALL:ALL) ALL
 
# See sudoers(5) for more information on "#include" directives:
 
#includedir /etc/sudoers.d

usermod -a -G root <username>