xbattbar: 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/xbattbar - from package: xbattbar

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

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