darkice: 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/darkice - from package: darkice

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

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