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

[Launchpad Bug Tracker]

[Expired for grub2 (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/1900838

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

Status in grub2 package in Ubuntu:
  Expired

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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