form2ufl: 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/form2ufl - from package: python-ufl

You may install the required package with command apt-get install {package}
Error in other languages:
form2ufl: bevel nie gevind nie
form2ufl: comandă negăsită
form2ufl: comando não encontrado
form2ufl: commande introuvable
form2ufl: command not found
form2ufl: käsku ei ole
form2ufl: không tìm thấy lệnh
form2ufl: komanda nerasta
form2ufl: Kommando nicht gefunden.
form2ufl: kommandot finns inte
form2ufl: komut yok
form2ufl: nie znaleziono polecenia
form2ufl: níor aimsíodh an t-ordú
form2ufl: no se encontró la orden
form2ufl: no s'ha trobat l'ordre
form2ufl: opdracht niet gevonden
form2ufl: parancs nem található
form2ufl: perintah tidak ditemukan
form2ufl: príkaz nenájdený
form2ufl: příkaz nenalezen
form2ufl: команда не найдена
form2ufl: командата не е открита
form2ufl: 命令找不到
form2ufl: コマンドが見つかりません