Comment 5 for bug 2067176

> 2 - When booting, sometimes the system fails to start when selecting the Kubuntu system.
It always works to start the system when I hold down the Capslok button after selecting the system.
But it's trial and error, as sometimes it doesn't start.

> It is easier to start the system if, before turning off the PC, click on the battery icon and change it to energy saving.
When it is in performance, the system fails to boot even when holding capslock. But when it is in energy saving mode, boot with capslock works almost every time. 👍

This does not sound like a bug in the bootloader, and I am skeptical of that fact that it has anything to do with the state of caps lock or power saving mode.

Would you be able to provide more information on where the boot process gets stuck. (If you see the graphical logo, press escape to show the console).

> 3 - There is also an error when trying to use the two Memory test options, in the grub menu.
Both give an error, saying that there is an error in the shim, something like that.

This is expected, you need to disable UEFI Secure Boot to run the memory test as it is not signed and won't be signed.