coinst_converter: 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/coinst_converter - from package: coinst-viewer

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

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