Kubuntu update left me with boot error

[plxjb2005]

A Kubuntu update left me with nothing but a blank screen with a blinking prompt.

I have an older Toshiba C850-120 system with 4 GB of RAM and a 480 GB SSD.

Trying to repair boot, I'm presented with an error message:
"GPT detected. Please create a BIOS-Boot partition (>1MB, unformatted filesystem, bios_grub flag). This can be performed via tools such as Gparted. Then try again."

The partition worked well before doing the update.

Boot repair gives me the following BootInfo summary:

http://paste.ubuntu.com/p/7ygVbn6cm3/

I don't know where to start in order to recover my system.

Joseph

[plxjb2005]

Found a solution after all. It took me a lot of searching around for a fix that has only three lines:

sudo mkdir /mnt/ubuntu
sudo mount /dev/sda1 /mnt/ubuntu
sudo grub-install --boot-directory=/mnt/ubuntu/boot /dev/sda

So this thread can be considered SOLVED.