wmanagerrc-update: 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/wmanagerrc-update - from package: wmanager

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

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