pavucontrol: 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/pavucontrol - from package: pavucontrol

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

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