authbind: 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/authbind - from package: authbind

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

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