for a protective MBR
by Skaperen from LinuxQuestions.org on (#5NAJ5)
i partitioned my spare hard drive (/dev/sdb) and installed Xubuntu 20.04 LTS on that drive. it is working. however, there is an error. all partitions were correctly written into the GPT table. however, the MBR was not written as a protective MBR. what program can i use, with what arguments to be coded in a script to make this correct in the future, will make the MBR be a true protective MBR, without altering the GPT (which is already correct and exact)?

