cvs-debrelease: 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/cvs-debrelease - from package: devscripts

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

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