mythtvfs: 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/mythtvfs - from package: mythtvfs

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

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