config ZSH shell as defoult shell in cubic

I ~think~ something like this should work...

1. List available shells

$cat /etc/shells

    # /etc/shells: valid login shells
    /bin/sh
    /bin/bash
    /usr/bin/bash
    /bin/rbash
    /usr/bin/rbash
    /bin/dash
    /usr/bin/dash

2. Install zsh

$ sudo apt-get install zsh

3. List available shells to make sure zsh was installed.

$cat /etc/shells

4. Change the default shell for all new users

$ nano /etc/default/useradd
# Change "SHELL=/bin/sh" to "SHELL=/bin/???" where ??? represents the new shell you want to use from step 3.

5. Configure zsh for all new users.

# Copy a valid ".zshrc" configuration file into the /etc/skel folder, so new users get the correct configuration.
# You can get the ".zshrc" from your current home directory on your host machine if you are currently running zsh.

6. Change the default shell for the root user

$ nano /etc/passwd
# Find the line "root:x:0:0:root:/root:/bin/bash"
# and change "/bin/bash" to "???" where ??? represents the new shell you want to use from step 3.

7.
# Copy a valid ".zshrc" configuration file into the /root folder, so the root users get the correct configuration.
# You can get the ".zshrc" from your current home directory on your host machine if you are currently running zsh.

(Please note, I've never tried this, and I don't know if Cubic's virtual terminal environment will continue to work, once you change the root user's shell in Cubic. If you try it, please let me know what happens).