grub2 – is it possible to change ubuntu configs via an Ubuntu Live?

my ubuntu after upgrading to 20.04 doesn’t boot normally and i tried some ways.(here i explained what i did)
i tried changing the grub config files or change the runlevel to text-mode, but the black screen still there.
and now i want to know that, can i change my main ubuntu (v 20.04) configs such as graphics card configs via a live linux?
i access to my file systems, but in a live linux.