hex2sfd: 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/hex2sfd - from package: unifont-bin

You may install the required package with command apt-get install {package}
Error in other languages:
hex2sfd: bevel nie gevind nie
hex2sfd: comandă negăsită
hex2sfd: comando não encontrado
hex2sfd: commande introuvable
hex2sfd: command not found
hex2sfd: käsku ei ole
hex2sfd: không tìm thấy lệnh
hex2sfd: komanda nerasta
hex2sfd: Kommando nicht gefunden.
hex2sfd: kommandot finns inte
hex2sfd: komut yok
hex2sfd: nie znaleziono polecenia
hex2sfd: níor aimsíodh an t-ordú
hex2sfd: no se encontró la orden
hex2sfd: no s'ha trobat l'ordre
hex2sfd: opdracht niet gevonden
hex2sfd: parancs nem található
hex2sfd: perintah tidak ditemukan
hex2sfd: príkaz nenájdený
hex2sfd: příkaz nenalezen
hex2sfd: команда не найдена
hex2sfd: командата не е открита
hex2sfd: 命令找不到
hex2sfd: コマンドが見つかりません