Public bug reported:
I had a Kubuntu hirsute installation since mid february and all was smooth.
After an upgrade around early april the iMac (a late 2012 27" iMac) wouldn't
boot, but remained stuck with the initial white screen (after the Apple sound).
I tried also a clean installation of kubuntu 21.04, but the problem persisted
(live usb boots fine, but once installed it won't boot).
Kubuntu 20.10 boots just fine.
I don't know if the blame belongs to grub or another package.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1926514
Title:
iMac late 2012 won't boot (Apple white screen)
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