roff2x: 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/roff2x - from package: groff

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

Error in other languages:
roff2x: bevel nie gevind nie
roff2x: comandă negăsită
roff2x: comando não encontrado
roff2x: commande introuvable
roff2x: command not found
roff2x: käsku ei ole
roff2x: không tìm thấy lệnh
roff2x: komanda nerasta
roff2x: Kommando nicht gefunden.
roff2x: kommandot finns inte
roff2x: komut yok
roff2x: nie znaleziono polecenia
roff2x: níor aimsíodh an t-ordú
roff2x: no se encontró la orden
roff2x: no s'ha trobat l'ordre
roff2x: opdracht niet gevonden
roff2x: parancs nem található
roff2x: perintah tidak ditemukan
roff2x: príkaz nenájdený
roff2x: příkaz nenalezen
roff2x: команда не найдена
roff2x: командата не е открита
roff2x: 命令找不到
roff2x: コマンドが見つかりません