D Configure The Base System from the Ubuntu Installation Guide by OnWorks

Now you’ve got a real Ubuntu system, though rather lean, on disk. chroot into it:

# LANG=C.UTF-8 chroot /mnt/ubuntu /bin/bash

After chrooting you may need to set the terminal definition to be compatible with the Ubuntu base system, for example:

# export TERM=xterm-color

Depending on the value of TERM, you may have to install the ncurses-term package to get support for it.

Note: If warnings occur like:

bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)

The required localization files need to be generated:

# sudo locale-gen en_US.UTF-8

Generating locales (this might take a while)... en_US.UTF-8... done

Generation complete.

D.4.4.1. Configure Apt