update-vflibcap: 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/sbin/update-vflibcap - from package: vflib3

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

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