Arrow keys, Home, End, tab-complete keys not working in shell

That probably means that the new user account was created with /bin/sh as its login shell (which symlinks to the dash shell by default) instead of /bin/bash - you can change a user's login shell with the 'chsh' command

sudo chsh -s /bin/bash <username>

(you will need to log out and back in for the change to take effect). You may also need to copy the default .bashrc from /etc/skel to get the color prompt.

In future you might want to use the 'adduser' command instead of 'useradd' - it sets up a more complete user environment including things like a default .profile and .bashrc - as well as setting the login shell to 'bash'

I was unable to use tab completion when connecting via VNC to a headless XFCE4. The answer listed here did not work but this did:

Edit Keyboard Shortcuts in xml file:

sudo nano ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml

Find:

<property name="&lt;Super&gt;Tab" type="string" value="switch_window_key"/>

Change it to:

<property name="&lt;Super&gt;Tab" type="empty"/>

Logout/reboot and should be good to go

I just installed Vim and everything was solved. At first, I thought that it was installed on the original version of Ubuntu since I was able to use Vi command, but it was not the case.

sudo apt-get install vim 

solved the problem.