installwatch: 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/installwatch - from package: checkinstall

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

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