undertaker-calc-coverage: 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/undertaker-calc-coverage - from package: undertaker

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

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