med-bio: 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/med-bio - from package: med-bio

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

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