Comment 11 for bug 353071

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Maybe this isn't a bug. I just noticed here
http://www.ubuntu.com/testing/jaunty/beta that it says

"Ext4 support in GRUB was provided by Colin King. If you choose to
upgrade your / or /boot filesystem in place from ext2 or ext3 to ext4
(as documented on the ext4 wiki
<http://ext4.wiki.kernel.org/index.php/Ext4_Howto#Converting_an_ext3_filesystem_to_ext4>),
*then you /must/ also use the grub-install command after upgrading to
Ubuntu 9.04 Beta to reinstall your boot loader. If you do not do this,
then the version of GRUB installed in your boot sector will not be
able to read the kernel from the ext4 filesystem and your system will
fail to boot.*"

What's odd is that it actually worked for a short period of time
without actually reinstalling Grub. I think what is confusing is that
people probably don't know that you need to reinstall Grub after
converting the file system as it's not really documented anywhere.
This is the first source that I've seen that says you need to
reinstall Grub afterwards.
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