twine-upload: 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/twine-upload - from package: twine

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

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