latexml: 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/latexml - from package: latexml

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

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