sshuttle: 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 CentOS possible default full paths are:

/usr/bin/sshuttle - from package: sshuttle

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/sshuttle - from package: sshuttle

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

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