checkpto: 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/checkpto - from package: hugin-tools

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

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