GOSA: 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/share/debian-lan-config/fai/config/files/usr/local/sbin/add2gosa/GOSA - from package: debian-lan-config
/usr/share/debian-lan-config/fai/config/files/usr/local/sbin/gosa-create/GOSA - from package: debian-lan-config
/usr/share/debian-lan-config/fai/config/files/usr/local/sbin/gosa-remove/GOSA - from package: debian-lan-config
/usr/share/debian-lan-config/fai/config/files/usr/local/sbin/gosa-sync/GOSA - from package: debian-lan-config
/usr/bin/gosa - from package: gosa-desktop

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

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