update-texmf-config: 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-texmf-config - from package: tex-common

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

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