Hi, there!
I have a clean installation of openSUSE Tumbleweed. (Dual boot: Windows 7 in sda, and openSUSE Tumbleweed in sdb.)
The installation and the system work fine, including GRUB2.
After installation, I modified the GRUB configuration by mean Yast, but when I restarted, the systems boot on Windows 7 (no GRUB menu).
Is there any way to re-install GRUB2 only, in graphical mode?
In a situation like that, I usually boot from the install disk and choose update/upgrade from the disk menu. In the software section, I deselect everything except for what I want to re-install. For me, it’s usually the kernel. You can of course check all sections, including the boot section to make sure that everything is as you want.
I have a related question. When I recently updated from 42.2 to Tumbleweed, the grub menu still refers to 42.2 even though selecting that option boots into Tumbleweed. I know there is a simple way to edit the text of the menu without changing the underlying workings. I just can’t remember how to do that (look at my avatar!)
Change the “Distributor” string in YaST->System->Boot Loader or /etc/default/grub (GRUB_DISTRIBUTOR, run grub2-mkconfig -o /boot/grub2/grub.cfg to recreate the menu in this case, YaST will do that automatically).
If you leave it empty, it should be determined from the installed system automatically.