qfractalnow: 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/qfractalnow - from package: fractalnow
/usr/share/fractalnow/bin/qfractalnow - from package: fractalnow

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

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