My laptop wont start properly when powering on

[Forpli]

It is possible that the dbx update has changed your BIOS settings. The BIOS from ACER is somewhat more specialized than others. You can take a look at this thread. Maybe you need to set ubuntu (=Zorin) as trusted and executable.

Boots to BIOS after installing Zorin OS

@Chris710 ACER BIOS are often special. In your BIOS you must set a supervisor password in tab security. Once the supervisor password is set, some new menus are accessible. Enter the "Select an UEFI file as trusted for executing" menu. It will allow you to declare the newly installed Ubuntu (=Zorin) boot image as trusted.