root@ubuntu:~#

mount -rw -o remount /

root@ubuntu:~# passwd jorge
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
root@ubuntu:~#

mount -o remount,rw /

nano -B /etc/shadow

username:$1$amFeNcjp$PprjCKEVk3UtzKwWfEMOY0:14920:0:99999:7:::

username::14920:0:99999:7:::

$ sudo -i
[sudo] password for myuseraccount:         # here you type the user's password
#

su

sudo mount /dev/sda1 /mnt

for d in dev sys run proc; do sudo mount --bind /$d /mnt/$d; done

passwd username

ls /home

passwd username

passwd susan

$6$lCu1.iVo$Q3nAL98jBLe5mMJ.0[...]boYhovrpyq7Tm.DztQB.