roff2ps: 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/roff2ps - from package: groff

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

Error in other languages:
roff2ps: bevel nie gevind nie
roff2ps: comandă negăsită
roff2ps: comando não encontrado
roff2ps: commande introuvable
roff2ps: command not found
roff2ps: käsku ei ole
roff2ps: không tìm thấy lệnh
roff2ps: komanda nerasta
roff2ps: Kommando nicht gefunden.
roff2ps: kommandot finns inte
roff2ps: komut yok
roff2ps: nie znaleziono polecenia
roff2ps: níor aimsíodh an t-ordú
roff2ps: no se encontró la orden
roff2ps: no s'ha trobat l'ordre
roff2ps: opdracht niet gevonden
roff2ps: parancs nem található
roff2ps: perintah tidak ditemukan
roff2ps: príkaz nenájdený
roff2ps: příkaz nenalezen
roff2ps: команда не найдена
roff2ps: командата не е открита
roff2ps: 命令找不到
roff2ps: コマンドが見つかりません