I've decided to upgrade from Ubuntu 14.04 to 16.04.3 and got one problem.
I have GPT drive and UEFI boot, the drive already has EFI boot partition, but when I try to install Ubuntu it says:
The partition table format in use on your disks normally requires you to create a separate partition for boot loader code. This partition should be marked for use as “Reserved BIOS boot area” and should be at least 1 MB in size. Note that this is not the same as a partition mounted on /boot. If you do not go back to the partitioning menu and correct this error, bootloader installation may fail later, although it may still be possible to install the boot loader to a partition.
Disk partitions are:
- EFI boot partition (128 MB fat32) (esp and boot flags)
- SWAP partition
- Ubuntu partition (ext4)
- Windows partition (ntfs)