update-ini-file: 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/bin/update-ini-file - from package: debian-edu-config

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

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