cobe: 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/cobe - from package: python-cobe

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