[Bug 1900838] Re: grub corrupted by routine system update -- maybe due to unconventional partitioning

[Steve Langasek]

Showing a partition table tells us nothing about the configuration of
the grub package and is thus unactionable.  Unless you can provide
information about the state of the grub package when the system is
failing (which is possibly by booting from a live CD and chrooting into
your install, instead of reinstalling), there's not going to be anything
we can do with this bug.

** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

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Title:
  grub corrupted by routine system update -- maybe due to unconventional
  partitioning

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  On two occasions in the last few months I have had to re-install grub after a software update.  I think that my disk partitioning is the problem.  Here the print from fdisk:
  Disk /dev/sda: 298.1 GiB, 320072933376 bytes, 625142448 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 4096 bytes
  I/O size (minimum/optimal): 4096 bytes / 4096 bytes
  Disklabel type: dos
  Disk identifier: 0x0f8002b1

  Device     Boot    Start       End   Sectors   Size Id Type
  /dev/sda1           2046  14667775  14665730     7G  5 Extended
  /dev/sda2       14667776  48222207  33554432    16G  b W95 FAT32
  /dev/sda3  *    48222208 625141759 576919552 275.1G 83 Linux
  /dev/sda5           2048  14667775  14665728     7G 83 Linux

  Partition 1 does not start on physical sector boundary.

  Partition table entries are not in disk order.

  The system is in /dev/sda3,  sda1 contains lubuntu and there is no
  operating system in sda2.  sda5 has only recently appeared and its
  existence is a complete mystery.  I got grub back by doing a re-
  install of lubuntu in /dev/sda1.

  I am using ubuntu18.04.5 -- and I apply all software updates.  (The
  user interface on 10.04LTS was better)

  It is impossible to get any more diagnostics because my machine just
  offers a blank screen with a blinking cursor in the top LH upon switch
  on.

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