cobertura-instrument: 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/cobertura-instrument - from package: cobertura

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

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