gem2deb: 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/gem2deb - from package: gem2deb

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

Error in other languages:
gem2deb: bevel nie gevind nie
gem2deb: comandă negăsită
gem2deb: comando não encontrado
gem2deb: commande introuvable
gem2deb: command not found
gem2deb: käsku ei ole
gem2deb: không tìm thấy lệnh
gem2deb: komanda nerasta
gem2deb: Kommando nicht gefunden.
gem2deb: kommandot finns inte
gem2deb: komut yok
gem2deb: nie znaleziono polecenia
gem2deb: níor aimsíodh an t-ordú
gem2deb: no se encontró la orden
gem2deb: no s'ha trobat l'ordre
gem2deb: opdracht niet gevonden
gem2deb: parancs nem található
gem2deb: perintah tidak ditemukan
gem2deb: príkaz nenájdený
gem2deb: příkaz nenalezen
gem2deb: команда не найдена
gem2deb: командата не е открита
gem2deb: 命令找不到
gem2deb: コマンドが見つかりません