ttfread: 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/ttfread - from package: cups-filters

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

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