Bug#966575: Security update can break grub - grub_calloc not found

[Geoff Gibbs]

On Fri, 31 Jul 2020 14:30:14 +0100
Steve McIntyre <steve at einval.com> wrote:

> I'm guessing - do you have multiple disks on your system? If so, try
> "grub-install <disk>" on each of the bootable disks and that should
> fix your problem.

As I mentioned,

mount /dev/sda5 /mnt
grub-install --boot-directory=/mnt /dev/sda

has fixed the problem for me.

fdisk -l reports :-

Disk /dev/sda: 223.6 GiB, 240057409536 bytes, 468862128 sectors
Disk model: Corsair Force GS
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc1920bad

Device     Boot  Start       End   Sectors   Size Id Type
/dev/sda1  *      2048    206847    204800   100M  7 HPFS/NTFS/exFAT
/dev/sda2       210942 468860927 468649986 223.5G  5 Extended
/dev/sda5       210944    722943    512000   250M 83 Linux
/dev/sda6       724992 468860927 468135936 223.2G 8e Linux LVM


Disk /dev/sdb: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: WDC WD10EZRX-00A
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: 0xc1920ba9

Device     Boot     Start        End    Sectors   Size Id Type
/dev/sdb1  *         2048  209717247  209715200   100G  7 HPFS/NTFS/exFAT
/dev/sdb2       209721342 1953523711 1743802370 831.5G  5 Extended
/dev/sdb5       209721344  230201343   20480000   9.8G 82 Linux swap / Solaris
/dev/sdb6       230203392 1953523711 1723320320 821.8G 8e Linux LVM

Partition 2 does not start on physical sector boundary.

And then there is a list of partitions handled by LVM (many for Xen)
but including :-

Disk /dev/mapper/SSD0-root: 20 GiB, 21474836480 bytes, 41943040 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/HDD0-var: 9.3 GiB, 9999220736 bytes, 19529728 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

Disk /dev/mapper/SSD0-home: 38.6 GiB, 41473277952 bytes, 81002496 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Geoff