kmixremote: 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/kmixremote - from package: kmix

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

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