set password to root ubuntu 20.04
$ sudo -i
$ passwd root
new password:...
confirm password:...
set password to root ubuntu 20.04
$ sudo -i
$ passwd root
new password:...
confirm password:...
change password ubuntu 20.04
open your terminal
ctrl-alt-t
passwd username
If you have admin password you can change all passwd of users
su -
passwd username
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