The default account will be root, however, this is not convinent when we use a container as a building environment,
all the user and group id will be set to root:root in this case.

Here are some useful commands to create a new user, it's also apply to traditional installation Ubuntu.

• Create a new user(superq) and a home directory

  useradd -m superq

• Set a password

  passwd superq

• Or set a empty password instead

  usermod -p U6aMy0wojraho superq

• Install sudo command and add this account to the sudoers file.

  apt install sudo -y

• Rather than modify /etc/sudoers directly, grant a user with sudo privilege with command below:

  usermod -G sudo -a superq