latexmlfind: 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/latexmlfind - from package: latexml

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

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