debcheckout: 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/debcheckout - from package: devscripts

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

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