first:
nano /etc/shadow
after that you will get something like this
root:$6$MLYE3AHZ$/lEpzz820jd3n96ST1pph3kWFxUCS6hqeMUozqcy8Wo0J/GzRbzoWga9177vlX353KPBGUzWR5qsxyzEf9Zbq0:15362:0:99999:7:::
It will look like this
root::15362:0:99999:7:::
delete all between first and second colons. Then save it.
There after edit another file
nano /etc/pam.d/gdm3
In this file comment 5th line.
#%PAM-1.0
auth requisite pam_nologin.so
auth required pam_env.so readenv=1
auth required pam_env.so readenv=1 envfile=/etc/default/locale
#auth required pam_succeed_if.so user != root quiet_success
@include common-auth
auth optional pam_gnome_keyring.so
@include common-account
session required pam_limits.so
@include common-session
session optional pam_gnome_keyring.so auto_start
@include common-password
Save and reboot your machine. now you can able to login as root without password.
Set your password with following command
root@localhost:~#passwd root
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