Existing GPT partition table seems to get corrupted by installer

I see some errors in one of these reports, but this should be not the cause:

grub: warn: gpt partition has no bios boot partition, embedding wont be possible

the commands that were send to the gpt partitions with GDISK is:

t
3
8300
w
Y
q

Which basically are the same commands that you will interactively run with gdisk to the disk, maybe these commands were bad set

After to try them in a virtual machine they does:

  • t: change a partitions type code
  • partition to modify is 3
  • type is 8300 (standard linux partition)
  • writes and quit....

That was on a 12gb partition with the original code 0700 (microsoft basic data), @triantares what was this partition before for ?

What was exactly the partitions 1, 2 and 3 for ? I see them with these sizes: 23,5 gb, 6 gb, 12 gb, then a fourth partition of 196 gb (this one should be the OS and/or HOME)