Hello Rumen,
I have checked all you talk about.
Everything was ok :
udev alredy installed and runing on my RPI.
Here is what the termina command returns.
****
bregou@bregou-desktop:~$ apt-cache policy udev
udev:
Installé : 229-4ubuntu12
Candidat : 229-4ubuntu12
Table de version :
*** 229-4ubuntu12 500
500 ports.ubuntu.com xenial-updates/main armhf Packages
100 /var/lib/dpkg/status
229-4ubuntu10 500
500 ports.ubuntu.com xenial-security/main armhf Packages
229-4ubuntu4 500
500 ports.ubuntu.com xenial/main armhf Packages
****
For some tests I have installed "xenial" maybe that is what makes some issues...

Thanks Rumen
Best regards

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