Comment # 19 on bug 1185601 from Fritz Hudnut

I'm re-posting this over here, as I have posted this "upstream" piggy-backing
onto what might be similar issues with recent zypper upgrades . . . Bugzilla
wasn't accepting my log in . . . so I'm commenting here . . . to report issues
with the upgrade, wiping ability to boot into any linux distros.

To Freedesktop/Github:

I'm adding my issues with recent upgrade to two versions of OpenSUSE on two
different Mac computers, TW & Leap 15.3 . . . after basic "zypper dup -l" it
appears that grub menu is wiped and the computer's booted to a white screen. 
One was a laptop '09 MacBookPro, but the other is '12 Mac Pro with external
display.  In both cases I couldn't get to a TTY from the whiteness, but I can
boot the systems via SuperGrub2, and then, in messing around with
"grub2-mkconfig" the desktop will boot into one option of my multi-boot linux
installs . . . but as with ubuntu and grub, it only boots itself, no grub menu
with the 5 or 6 linux options will show up.  So far my Gecko installs have not
been affected . . . more or less current, so I believe she has it running
5.12???