conmux-registry: 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 CentOS possible default full paths are:

/usr/sbin/conmux-registry - from package: conmux

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/conmux-registry - from package: conmux

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

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