update-user-group-ssh.sh: 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/gforge/plugins/scmcvs/bin/update-user-group-ssh.sh - from package: fusionforge-plugin-scmcvs

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

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