Boot hangs at "Loading initial ramdisk" with linux-image-unsigned-4.4.0-194-generic and 197-generic

[vla2539]

Hello,

My laptop was working fine up to "linux-image-unsigned-4.4.0-193-generic". I regularly updates the system with "sudo apt-get update && safe-upgrade". But now it fails to boot with both linux-image-unsigned-4.4.0-194-generic and linux-image-unsigned-4.4.0-197-generic. Meanwhile, booting in failsafe mode is ok with linux-image-unsigned-4.4.0-197-generic but the graphic driver doesn't seem to be properly started as I have only one screen with poor resolution.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-193-generic (not installed)
ProcVersionSignature: Ubuntu 4.4.0-193.224-generic 4.4.236
Uname: Linux 4.4.0-193-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.27
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Dec 5 22:39:00 2020
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)