avfsd: command not found

Have You tried accessing the binary with the full path?

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/avfsd - from package: avfs

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