vifm: command not found

Have You tried accessing the binary with the full path?

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/vifm - from package: vifm

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