add_text: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/share/gfxboot/themes/KDE/po/bin/add_text - from package: gfxboot-themes
/usr/share/gfxboot/themes/openSUSE/po/bin/add_text - from package: gfxboot-themes
/usr/share/gfxboot/themes/SLED/po/bin/add_text - from package: gfxboot-themes
/usr/share/gfxboot/themes/SLES/po/bin/add_text - from package: gfxboot-themes
/usr/share/gfxboot/themes/upstream/po/bin/add_text - from package: gfxboot-themes

You may install the required package with command apt-get install {package}

Error in other languages:
add_text: bevel nie gevind nie
add_text: comandă negăsită
add_text: comando não encontrado
add_text: commande introuvable
add_text: command not found
add_text: käsku ei ole
add_text: không tìm thấy lệnh
add_text: komanda nerasta
add_text: Kommando nicht gefunden.
add_text: kommandot finns inte
add_text: komut yok
add_text: nie znaleziono polecenia
add_text: níor aimsíodh an t-ordú
add_text: no se encontró la orden
add_text: no s'ha trobat l'ordre
add_text: opdracht niet gevonden
add_text: parancs nem található
add_text: perintah tidak ditemukan
add_text: príkaz nenájdený
add_text: příkaz nenalezen
add_text: команда не найдена
add_text: командата не е открита
add_text: 命令找不到
add_text: コマンドが見つかりません