troff2text: command not found

Have You tried accessing the binary with the full path?

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/troff2text - from package: troffcvt

You may install the required package with command apt-get install {package}
Error in other languages:
troff2text: bevel nie gevind nie
troff2text: comandă negăsită
troff2text: comando não encontrado
troff2text: commande introuvable
troff2text: command not found
troff2text: käsku ei ole
troff2text: không tìm thấy lệnh
troff2text: komanda nerasta
troff2text: Kommando nicht gefunden.
troff2text: kommandot finns inte
troff2text: komut yok
troff2text: nie znaleziono polecenia
troff2text: níor aimsíodh an t-ordú
troff2text: no se encontró la orden
troff2text: no s'ha trobat l'ordre
troff2text: opdracht niet gevonden
troff2text: parancs nem található
troff2text: perintah tidak ditemukan
troff2text: príkaz nenájdený
troff2text: příkaz nenalezen
troff2text: команда не найдена
troff2text: командата не е открита
troff2text: 命令找不到
troff2text: コマンドが見つかりません