latex-mk: 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/latex-mk - from package: latex-mk

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

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