ufl-version: 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

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/ufl-version - from package: python-ufl

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