I don’t get what do you mean with this?
to agglomerate your other posts -
grub is actually an acronym, “GRUB”, stands for Grand Unified Bootloader. It can be used to select between different operating systems on your hard disk to boot up - different iterations of linux distributions, Windows, etc. It is used by openSUSE (and as far as I can tell, all other modern linux distributions).
One of the advantages of grub is that you can use it to pass boot options to the linux kernel on a “one off” basis, i.e. you don’t need to “reinstall” anything if you want to change things. On an x86 PC with BIOS, when you power up, you get all the various BIOS boot messages (memory count, disks detected etc.) - immediately following this, should be the grub menu - you get to use the arrow keys to highlight and select what options you want to boot (one of them should be “failsafe”).
You can hit “e” and add an entry “init 3”. this should boot you to non-graphical mode.
Ubuntu is another linux distribution. It’s not a disease. The name is based on a Zulu word meaning “humanity to others”.