Lost my root password under Kubuntu 20 : How can I restore it?

Somehow I lost my root password under Kubuntu 20 :

$ sudo -s
[sudo] password for master: 
Sorry, try again.

I do not think I forget it. It is simple “1”.
It is my home laptop - nobody else has access to it.

Any ideas how can I restore it?

When loading OS some menu options on loading ?

Usually I have installed firewall w3ith options like :

sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip

To                         Action      From
--                         ------      ----
80,443/tcp (Apache Full)   ALLOW IN    Anywhere
80,443/tcp (Apache Full (v6)) ALLOW IN    Anywhere (v6)

I failed to run it now as I can not login under root ?

$ uname -a
Linux master-at-home 5.15.0-41-generic #44~20.04.1-Ubuntu SMP Fri Jun 24 13:27:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux


https://askubuntu.com/questions/24006/how-do-i-reset-a-lost-administrative-password ?

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