suffix2instance: command not found

Have You tried accessing the binary with the full path?

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

[root@server ~]# echo $PATH

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/sbin/suffix2instance - from package: 389-ds-base

You may install the required package with command apt-get install {package}
Error in other languages:
suffix2instance: bevel nie gevind nie
suffix2instance: comandă negăsită
suffix2instance: comando não encontrado
suffix2instance: commande introuvable
suffix2instance: command not found
suffix2instance: käsku ei ole
suffix2instance: không tìm thấy lệnh
suffix2instance: komanda nerasta
suffix2instance: Kommando nicht gefunden.
suffix2instance: kommandot finns inte
suffix2instance: komut yok
suffix2instance: nie znaleziono polecenia
suffix2instance: níor aimsíodh an t-ordú
suffix2instance: no se encontró la orden
suffix2instance: no s'ha trobat l'ordre
suffix2instance: opdracht niet gevonden
suffix2instance: parancs nem található
suffix2instance: perintah tidak ditemukan
suffix2instance: príkaz nenájdený
suffix2instance: příkaz nenalezen
suffix2instance: команда не найдена
suffix2instance: командата не е открита
suffix2instance: 命令找不到
suffix2instance: コマンドが見つかりません