gf2pbm: 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/gf2pbm - from package: mftrace

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

Error in other languages:
gf2pbm: bevel nie gevind nie
gf2pbm: comandă negăsită
gf2pbm: comando não encontrado
gf2pbm: commande introuvable
gf2pbm: command not found
gf2pbm: käsku ei ole
gf2pbm: không tìm thấy lệnh
gf2pbm: komanda nerasta
gf2pbm: Kommando nicht gefunden.
gf2pbm: kommandot finns inte
gf2pbm: komut yok
gf2pbm: nie znaleziono polecenia
gf2pbm: níor aimsíodh an t-ordú
gf2pbm: no se encontró la orden
gf2pbm: no s'ha trobat l'ordre
gf2pbm: opdracht niet gevonden
gf2pbm: parancs nem található
gf2pbm: perintah tidak ditemukan
gf2pbm: príkaz nenájdený
gf2pbm: příkaz nenalezen
gf2pbm: команда не найдена
gf2pbm: командата не е открита
gf2pbm: 命令找不到
gf2pbm: コマンドが見つかりません