the computer freezes at login

[Andrea]

At the login page, when the list of users of the computer appears, I have a very limited time to press enter, write my password and then press enter again to turn on the pc. When I succeeded to do this (otherwise I have to turn of the computer pressing the power button), the computer freezed after loading the desktop page. In any case, when the pc freezes neither the keyboard, nor the mouse work.
It seems that the problem is related to graphical drivers, since if in the grub I start the computer in recovery mode, everything works fine. On Ubuntu forums it is suggested that the problem is related to nvidia graphical driver, but it is not installed on my computer.

Description: Ubuntu 18.04 LTS (beaver-three-eyed-raven X92)
Release: 18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-1064-oem 4.15.0-1064.73
ProcVersionSignature: Ubuntu 4.15.0-1064.73-oem 4.15.18
Uname: Linux 4.15.0-1064-oem x86_64
NonfreeKernelModules: vtsspp sep5 socperf3 pax wl
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 17 00:58:27 2020
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-bionic-amd64-20180608-47+beaver-three-eyed-raven+X92
InstallationDate: Installed on 2019-10-15 (93 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38
SourcePackage: linux-signed-oem
UpgradeStatus: No upgrade log present (probably fresh install)