gregxform: 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/lib/cmtk/bin/gregxform - from package: cmtk

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

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