ffihugs: 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/ffihugs - from package: hugs

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