Password Problem on NextCloudPi Distro Upgrade

I’m posting this by way of passing a solution on to others.

I recently did a distro upgrade to NCP as described in Everything seemed to go okay and I proceeded on to upgrade NC to 16.0. The upgrade wouldn’t work and threw the error:

sudo: Account or password is expired, reset your password and try again
sudo: no tty present and no askpass program specified
sudo: unable to change expired password: Authentication token manipulation error

I wasn’t sure what password needed to be changed. I tried the NCP web admin password, then the pi user password (which is also the credential used for SSH), and then the NC admin password – all with no luck on fixing the problem.

Finally I remembered that there is also a password for root. To change that one you need to switch to su in the SSH terminal. (see if you don’t know what I’m talking about.)

After that the NC upgrade proceeded fine and everything seems to be working okay.