littcvt: 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/littcvt - from package: simh

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

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