icontainer2icns: 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/icontainer2icns - from package: icnsutils

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

Error in other languages:
icontainer2icns: bevel nie gevind nie
icontainer2icns: comandă negăsită
icontainer2icns: comando não encontrado
icontainer2icns: commande introuvable
icontainer2icns: command not found
icontainer2icns: käsku ei ole
icontainer2icns: không tìm thấy lệnh
icontainer2icns: komanda nerasta
icontainer2icns: Kommando nicht gefunden.
icontainer2icns: kommandot finns inte
icontainer2icns: komut yok
icontainer2icns: nie znaleziono polecenia
icontainer2icns: níor aimsíodh an t-ordú
icontainer2icns: no se encontró la orden
icontainer2icns: no s'ha trobat l'ordre
icontainer2icns: opdracht niet gevonden
icontainer2icns: parancs nem található
icontainer2icns: perintah tidak ditemukan
icontainer2icns: príkaz nenájdený
icontainer2icns: příkaz nenalezen
icontainer2icns: команда не найдена
icontainer2icns: командата не е открита
icontainer2icns: 命令找不到
icontainer2icns: コマンドが見つかりません