musixtex: 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/musixtex - from package: musixtex

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

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