I'm considering converting from BIOS to UEFI to make my boot faster.
Will it be faster?
Am I going to run into UEFI bugs?

I read I need to convert my partition table from MBR to GPT first.

gdisk gave me this warning.
>Warning! Secondary partition table overlaps the last partition by
33 blocks!

Looks fine to me:

Device Start End
/dev/nvme0n1p2                262146047
/dev/nvme0n1p3      262146048
What is the problem?

$ sudo gdisk /dev/nvme0n1
GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: MBR only
  BSD: not present
  APM: not present
  GPT: not present


***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory. THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by
typing 'q' if you don't want to convert your MBR partitions
to GPT format!
***************************************************************


Warning! Secondary partition table overlaps the last partition by
33 blocks!
You will need to delete this partition or resize it in another utility.

Command (? for help): q

$ sudo fdisk /dev/nvme0n1

Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): p
Disk /dev/nvme0n1: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Disk model: HP SSD EX900 250GB
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: 0x2acf1edc

Device         Boot Start       End   Sectors   Size Id Type
/dev/nvme0n1p1           2048  52430847  52428800    25G 83 Linux
/dev/nvme0n1p2       52430848 262146047 209715200   100G 83 Linux
/dev/nvme0n1p3      262146048488397167 226251120 107.9G 83 Linux



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