epiphany-browser: 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/epiphany-browser - from package: epiphany-browser

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

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