xfaces: 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/xfaces - from package: xfaces

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

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