I have upgraded my leap 15.1 to 15.2. It was an ‘upgrade’, not a new install.
The upgrade seemed to go fine, but now I can only boot-up the upgraded system when I have the installation-USB drive still in its slot. That is, with the 15.2 stick connected, I get the installation options of which I choose the default one: installation from hard disk. The system boots into 15.2 and the system works all-right.
However, when I remove the usb-drive, I can no longer boot-up my system. The system stops where it is supposed to boot from the hard disk.
I have not made any modification to the BIOS settings. The hard disk is number 3 in the boot sequence, after the USB (1st) and the CD-ROM dirve (2nd), as it has always been.
After you’ve re-installed the GRUB2 boot loader on the system, you have to re-install it as a boot-loader –
# grub2-mkconfig -o /boot/grub2/grub.cfg
The GRUB2 “make configuration” should re-write the Master Boot Record (MBR) – you can be sure that the MBR will be rewritten if you use YaST – and make sure to enable the “Write generic Boot Code to MBR” option …