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The kernel is still using the old partition table.

Issue partprobe for the kernel to use the new partition table or reboot.

See man partprobe for the gory details.

EDIT (thanks to comments):

gdisk prints the following Warning message informing you that the kernel is still using the old partition table, inviting you to restart.

Warning: The kernel is still using the old partition table. The new table will be used at the next reboot. The operation has completed successfully.

fdisk and parted (including gparted) do the partprobe automatically and inform you whether it succeeded or not.

The kernel is still using the old partition table.

Issue partprobe for the kernel to use the new partition table or reboot.

See man partprobe for the gory details.

The kernel is still using the old partition table.

Issue partprobe for the kernel to use the new partition table or reboot.

See man partprobe for the gory details.

EDIT (thanks to comments):

gdisk prints the following Warning message informing you that the kernel is still using the old partition table, inviting you to restart.

Warning: The kernel is still using the old partition table. The new table will be used at the next reboot. The operation has completed successfully.

fdisk and parted (including gparted) do the partprobe automatically and inform you whether it succeeded or not.

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source | link

The kernel is still using the old partition table.

Issue partprobe for the kernel to use the new partition table or reboot.

See man partprobe for the gory details.