update-texmf: 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 - from package: tex-common

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

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