Pourquoi les scripts dans /etc/profile.d/ sont-ils ignorés (alias bash à l'échelle du système) ?

Je suis nouveau sur Ubuntu. J'utilise la version 13.10 Desktop.

Je voulais définir des alias pour l'ensemble du système et une invite personnalisée pour bash. J'ai trouvé cet article :

https://help.ubuntu.com/community/EnvironmentVariables

En suivant les conseils de cet article, j'ai créé /etc/profile.d/profile_local.sh. Il appartient à root et a des permissions de 644 tout comme les autres scripts qui s'y trouvent :

root@ubuntu:/etc/profile.d# ll
total 28
drwxr-xr-x   2 root root  4096 Mar 23 08:56 .
drwxr-xr-x 135 root root 12288 Mar 23 09:15 ..
-rw-r--r--   1 root root   660 Oct 23  2012 bash_completion.sh
-rw-r--r--   1 root root  3317 Mar 23 07:36 profile_local.sh
-rw-r--r--   1 root root  1947 Nov 23 00:57 vte.sh

J'ai également confirmé que /etc/profile appelle /etc/profile.d. Il contient ce bloc de code :

if [ -d /etc/profile.d ]; then
  for i in /etc/profile.d/*.sh; do
    if [ -r $i ]; then
      . $i
    fi
  done
  unset i
fi

Lors de la connexion, il ne semble pas que le script personnalisé, profile_local.sh que j'ai créé soit sourcé. Cependant, si après la connexion je "source /etc.profile.d/profile_local.sh", j'obtiens le comportement attendu, mes alias personnalisés et mon invite personnalisée.

Qu'est-ce que je fais de mal ?

Contenu du script 'profile_local.sh' :

# 3/23/14 - Copied from Gentoo /etc/bash/bashrc
# Placed in /etc/profile.d as described at:
# https://help.ubuntu.com/community/EnvironmentVariables

# This file is sourced by all *interactive* bash shells on startup,
# including some apparently interactive shells such as scp and rcp
# that can't tolerate any output.  So make sure this doesn't display
# anything or bad things will happen !

# Test for an interactive shell.  There is no need to set anything
# past this point for scp and rcp, and it's important to refrain from
# outputting anything in those cases.
if [[ $- != *i* ]] ; then
        # Shell is non-interactive.  Be done now!
        return
fi

# Bash won't get SIGWINCH if another process is in the foreground.
# Enable checkwinsize so that bash will check the terminal size when
# it regains control.  #65623
# http://cnswww.cns.cwru.edu/~chet/bash/FAQ (E11)
shopt -s checkwinsize

# Enable history appending instead of overwriting.  #139609
shopt -s histappend

# Change the window title of X terminals 
case ${TERM} in
        xterm*|rxvt*|Eterm|aterm|kterm|gnome*|interix)
                PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}\007"'
                ;;
        screen)
                PROMPT_COMMAND='echo -ne "\033_${USER}@${HOSTNAME%%.*}:${PWD/#$HOME/~}\033\\"'
                ;;
esac

use_color=false

# Set colorful PS1 only on colorful terminals.
# dircolors --print-database uses its own built-in database
# instead of using /etc/DIR_COLORS.  Try to use the external file
# first to take advantage of user additions.  Use internal bash
# globbing instead of external grep binary.
safe_term=${TERM//[^[:alnum:]]/?}   # sanitize TERM
match_lhs=""
[[ -f ~/.dir_colors   ]] && match_lhs="${match_lhs}$(<~/.dir_colors)"
[[ -f /etc/DIR_COLORS ]] && match_lhs="${match_lhs}$(</etc/DIR_COLORS)"
[[ -z ${match_lhs}    ]] \
        && type -P dircolors >/dev/null \
        && match_lhs=$(dircolors --print-database)
[[ $'\n'${match_lhs} == *$'\n'"TERM "${safe_term}* ]] && use_color=true

if ${use_color} ; then
        # Enable colors for ls, etc.  Prefer ~/.dir_colors #64489
        if type -P dircolors >/dev/null ; then
                if [[ -f ~/.dir_colors ]] ; then
                        eval $(dircolors -b ~/.dir_colors)
                elif [[ -f /etc/DIR_COLORS ]] ; then
                        eval $(dircolors -b /etc/DIR_COLORS)
                fi
        fi

        if [[ ${EUID} == 0 ]] ; then
                PS1='\[\033[01;31m\]\h\[\033[01;34m\] \W \$\[\033[00m\] '
        else
                PS1='\[\033[01;32m\]\u@\h\[\033[01;34m\] \w \$\[\033[00m\] '
        fi

        alias ls='ls --color=auto'
        alias grep='grep --colour=auto'
else
        if [[ ${EUID} == 0 ]] ; then
                # show root@ when we don't have colors
                PS1='\u@\h \W \$ '
        else
                PS1='\u@\h \w \$ '
        fi
fi

# Try to keep environment pollution down, EPA loves us.
unset use_color safe_term match_lhs

TZ="PST8PDT"

alias ll='ls -la'
alias dig='dig +search'
alias dir='ls -ba'

alias edit="ee"
alias ss="ps -aux"
alias dot='ls .[a-zA-Z0-9_]*'
alias news="xterm -g 80x45 -e trn -e -S1 -N &"

alias more="less"
alias c="clear"
alias m="more"
alias j="jobs"

# common misspellings
alias mroe=more
alias pdw=pwd