troff2rtf: 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/troff2rtf - from package: troffcvt

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

Error in other languages:
troff2rtf: bevel nie gevind nie
troff2rtf: comandă negăsită
troff2rtf: comando não encontrado
troff2rtf: commande introuvable
troff2rtf: command not found
troff2rtf: käsku ei ole
troff2rtf: không tìm thấy lệnh
troff2rtf: komanda nerasta
troff2rtf: Kommando nicht gefunden.
troff2rtf: kommandot finns inte
troff2rtf: komut yok
troff2rtf: nie znaleziono polecenia
troff2rtf: níor aimsíodh an t-ordú
troff2rtf: no se encontró la orden
troff2rtf: no s'ha trobat l'ordre
troff2rtf: opdracht niet gevonden
troff2rtf: parancs nem található
troff2rtf: perintah tidak ditemukan
troff2rtf: príkaz nenájdený
troff2rtf: příkaz nenalezen
troff2rtf: команда не найдена
troff2rtf: командата не е открита
troff2rtf: 命令找不到
troff2rtf: コマンドが見つかりません