When the following packages are update:
grub-common from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub2-common from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub-efi-amd64-bin from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub-efi-amd64-signed from version (1.128+2.04-1ubuntu12) to (1.128.2+2.04-1ubuntu12.2)
grub-pc from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub-pc-bin from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
I can confirm that these packages are responsible for the reboot issue and trying to install the outdated versions of ubuntu 19.10 on ubuntu 20.04 or 20.10 the laptop restarts normally.
I found the root of the issue.
Ubuntu 19.10, clean installation, no updates.
When the following packages are update: amd64-signed from version (1.128+ 2.04-1ubuntu12) to (1.128. 2+2.04- 1ubuntu12. 2)
grub-common from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub2-common from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub-efi-amd64-bin from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub-efi-
grub-pc from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
grub-pc-bin from version (2.04-1ubuntu12) to (2.04-1ubuntu12.2)
I can confirm that these packages are responsible for the reboot issue and trying to install the outdated versions of ubuntu 19.10 on ubuntu 20.04 or 20.10 the laptop restarts normally.