sudo gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.

Warning! Main and backup partition tables differ! Use the 'c' and 'e' options
on the recovery & transformation menu to examine the two tables.
Warning! One or more CRCs don't match. You should repair the disk!

Partition table scan:
MBR: hybrid
BSD: not present
APM: not present
GPT: damaged

Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.

Command (? for help): p
Disk /dev/sdb: 125067264 sectors, 59.6 GiB
Model: Multi-Card
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 76A0F070-E171-475B-9409-53840D61AD12
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 4194270
Partitions will be aligned on 2048-sector boundaries
Total free space is 671677 sectors (328.0 MiB)


Number  Start (sector)    End (sector)  Size       Code  Name
1            2048           67583   32.0 MiB    0C01  hassos-boot
2           67584          116735   24.0 MiB    8300  hassos-kernel0
3          116736          641023   256.0 MiB   8300  hassos-system0
4          641024          690175   24.0 MiB    8300  hassos-kernel1
5          690176         1214463   256.0 MiB   8300  hassos-system1
6         1214464         1230847   8.0 MiB     8300  hassos-bootstate
7         1230848         1427455   96.0 MiB    8300  hassos-overlay
8         1427456         3524607   1024.0 MiB  8300  hassos-data

Caution: The CRC for the backup partition table is invalid. This table may
be corrupt. This program will automatically create a new backup partition
table when you save your partitions.

Problem: The secondary header's self-pointer indicates that it does not reside
at the end of the disk. If you've added a disk to a RAID array, use the 'e'
option on the experts' menu to adjust the secondary header's and partition
table's locations.

Identified 2 problems!

No problems found. 121544637 free sectors (58.0 GiB) available in 2
segments, the largest of which is 121542623 (58.0 GiB) in size.

OK: writing new GUID partition table (GPT) to /dev/sdb.
 The operation has completed successfully.

OK: writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.