groupware-install: 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/groupware-install - from package: php-horde-groupware

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

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