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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 a "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, boot loader installation may fail later, although it may still be possible to install the boot loader to a partition.

kubuntu@kubuntu:~$ sudo fdisk -l
Disk /dev/loop0: 1,68 GiB, 1783603200 bytes, 3483600 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes




Disk /dev/sda: 465,78 GiB, 500107862016 bytes, 976773168 sectors
Disk model: TOSHIBA MQ01ABD0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: B2C8A409-25AD-458E-9B0C-473C5CAE1D35

Device         Start       End   Sectors   Size Type
/dev/sda1       2048    923647    921600   450M Windows recovery environment
/dev/sda2     923648   1128447    204800   100M EFI System
/dev/sda3    1128448   1161215     32768    16M Microsoft reserved
/dev/sda4    1161216 657238051 656076836 312,9G Microsoft basic data
/dev/sda5  975138816 976769023   1630208   796M Windows recovery environment
/dev/sda6  657240064 975138815 317898752 151,6G Linux filesystem

Partition table entries are not in disk order.


Disk /dev/sdb: 7,37 GiB, 7900845056 bytes, 15431338 sectors
Disk model: Cruzer Edge     
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: 0x6511e92e

Device     Boot   Start      End  Sectors  Size Id Type
/dev/sdb1  *          0  4597727  4597728  2,2G  0 Empty
/dev/sdb2       3689420  3697355     7936  3,9M ef EFI (FAT-12/16/32)
/dev/sdb3       4599808 15431337 10831530  5,2G 83 Linux
kubuntu@kubuntu:~$