Public bug reported:
Background:
Upon configuration the postinst maintainer script checks to see whether it
needs to convert the debconf variable install_devices from the old device name
format to the new 'by-id' format. It bases this decision on a version
comparison against the "previously installed".
In a new installation, this comparison is successful since the empty
version string is older than any other version.
postinst then goes on to check a few special cases where it can make
informed decisions on whether the conversion was good without involving
the user. Failing those checks it forces the debconf question to be
presented to the user again with the converted device ids for
confirmation.
Problem:
If an administrator has preseeded the install_devices question (using the new
'by-id' format) before installing grub-pc, then the above algorithm incorrectly
decides that the user needs to confirm the devices again.
Solution:
The attached patch adds another special case that checks if the device IDs
where already in the new 'by-id' format and in that case accepts them without
asking the user again.
Versions:
I have observed this bug for many years, but only now gotten around to tracking
it to its source. The patch is against version 2.02-2ubuntu8.4 of grub-pc.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "patch against version 2.02-2ubuntu8.4 of grub-pc"
https://bugs.launchpad.net/bugs/1791200/+attachment/5185869/+files/grub-pc.diff
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https://bugs.launchpad.net/bugs/1791200
Title:
grub-pc does not allow preseeding install_devices
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