Public bug reported:
Legacy BIOS system (not UEFI), MBR partition table.
Ubuntu 26.04 installs successfully on /dev/sdb1, but GRUB cannot boot
it.
GRUB console:
ls (hd1,msdos1)
→ unknown filesystem
ls (hd1,msdos5)
→ ext filesystem detected
Ubuntu 22.04 on /dev/sdb5 boots normally.
Replacing Ubuntu 26.04 with Ubuntu 24.04.4 on the same partition
(/dev/sdb1) fixes the problem immediately and Ubuntu 24 boots
successfully.
This may be a GRUB/ext4 compatibility issue on BIOS systems.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2155718
Title:
ubuntu-bug grub2
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