raxml: 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/raxml - from package: argus-client

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

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