I used the following command to check the MBR code in hexadecimal
hd -n 512 -v /dev/sda
Which displayed this:
It seems to me, that there is only one partition there. I have dual boot with linux and windows, shouldn't at least there be two?
And, according to this website
https://www.bydavy.com/2012/01/lets-decrypt-a-master-boot-record/
At the adress 1bE, it should be "80" instead of "00", since 80 means it is bootable.