weston: 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/weston - from package: weston

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

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