Mate issues after update (GUI)

Hello all

I have an installation of Ubuntu Mate 20.04.03.
Well, I think since the update at the beginning of the week, I have various problems with the GUI. For example, I can no longer launch the graphical interface of the firewall or GPartet. (according to terminal the UFW is enabled)

When I want to install a .deb package, I click on it, the window with the details opens and as soon as I click on install, it disappears without doing anything.

Another question: since the update I am always asked for username when logging in, before the update the user was already selected (there is only 1 user on the system) and I only had to enter the password and not first the b

Also I have problems with the OpenVPN connection, which does not open anymore, (cipher error).

Do you also have these problems and possibly a solution? Are these problems related to the new kernel update? I think I got some kernel updates...

Thank you very much for you support.

BR
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