coinst: 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 - from package: coinst

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

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