1) Bug #491740 : disk with abnormally small (<32kb) embed area. GRUB Legacy OK , GRUB2 KO --> regression
2) Bug #1004376 : RAID+LVM : 10.04 ok , 12.04 KO --> regression
3) BTRFS:
KO on 11.04 (Bugs #782543 , #781010 , #774217)
KO on 11.10 (Bug #885264 , #881342 , #879109 , #873392 , #842247 , #813259 , #800840)
KO on 12.04 (Bugs #990558 , #988848 , #953559 , #945449 , #928128 , #917212 ),
KO on 12.10 (Bug #1045178)
---> not a regression, unless we show it worked with a previous version of GRUB.
Looking at current duplicates show only 3 cases :
1) Bug #491740 : disk with abnormally small (<32kb) embed area. GRUB Legacy OK , GRUB2 KO --> regression
2) Bug #1004376 : RAID+LVM : 10.04 ok , 12.04 KO --> regression
3) BTRFS:
KO on 11.04 (Bugs #782543 , #781010 , #774217)
KO on 11.10 (Bug #885264 , #881342 , #879109 , #873392 , #842247 , #813259 , #800840)
KO on 12.04 (Bugs #990558 , #988848 , #953559 , #945449 , #928128 , #917212 ),
KO on 12.10 (Bug #1045178)
---> not a regression, unless we show it worked with a previous version of GRUB.