Follow-up Comment #3, bug #35354 (project grub):
The part "as available through BIOS" wasn't gratuituous. Many BIOSes give
garbage instead of ID.
Also I wanted to mention that with duplicate UUIDs you may also run into other
problems like RAID or btrfs misassembly.
To change UUID on ext*:
tune2fs -U random /dev/sdXN
on xfs:
xfs_admin -U generate /dev/sdXN
on jfs:
jfs_tune -U random /dev/sdXN
on nilfs2:
nilfs-tune -U `uuid -v 4`/dev/sdXN
on reiserfs:
reiserfs-tune -U `uuid -v 4`/dev/sdXN
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