debcommit: 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/debcommit - from package: devscripts

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

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