There are 2 issues at play here:
a. bug 1666853: grub2 does not work correctly in 16.04 with ext4 filesystems 
larger than 2TB.  This appears to be fixed in 18.04, but the bug is not 
currently  marked as fixed there.

b. bug 1762748 was SRU'd to 16.04 which exposed bug 1666853.  Before
that fix, the filesystem would not get correctly grown and the bug would
not be seen.

So there are two paths forward here:
1.) revert the change in bug 1762748 in 16.04 so that we do not expose bug 
1666853.
2.) locate and SRU a fix for bug 1666853 to 16.04 so that large disks function 
as desired.



** Changed in: cloud-init (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1812411

Title:
  cloud-init corrupting grub

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