uptex: 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/uptex - from package: texlive-binaries

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

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