microcom: 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/microcom - from package: microcom

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

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