kazulog@sv1:~$ sudo passwd -S root
root P 2026-09-10 0 99999 7 -1
kazulog@sv1:~$ sudo script -q -c login /dev/null
sv1 login: root
Password: 
Welcome to Ubuntu 26.04 LTS (GNU/Linux 7.0.0-30-generic x86_64)

 * Documentation:  https://docs.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/pro

 System information as of Thu Sep 10 13:34:28 JST 2026

  System load:  0.28              Processes:             108
  Usage of /:   3.1% of 60.93GB   Users logged in:       0
  Memory usage: 11%               IPv4 address for ens2: 10.19.12.11
  Swap usage:   0%


Expanded Security Maintenance for Applications is not enabled.

0 updates can be applied immediately.

Enable ESM Apps to receive additional future security updates.
See https://ubuntu.com/esm or run: sudo pro status


The list of available updates is more than a week old.
To check for new updates run: sudo apt update


The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

root@sv1:~# whoami
root
root@sv1:~# tty
/dev/pts/2root@sv1:~# exit

logout
kazulog@sv1:~$ sudo passwd -l root
passwd: password changed.
kazulog@sv1:~$ sudo usermod -p '*' root
kazulog@sv1:~$ sudo chage -d 2026-08-23 root
kazulog@sv1:~$ sudo passwd -S root
root L 2026-08-23 0 99999 7 -1
kazulog@sv1:~$ sudo grep '^root:' /etc/shadow
root:*:20688:0:99999:7:::
kazulog@sv1:~$ su -
Password: 
su: Authentication failure