update-catalog: 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/sbin/update-catalog - from package: sgml-base

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

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