Did you check (non-interactively) with "-l":
fdisk -l /dev/sda? Or just
fdisk -l? To get an overwiev.
This gives me:
Device Start End Sectors Size Type
/dev/sda1 2048 83888127 83886080 40G Linux filesystem
/dev/sda2 83888128 109053951 25165824 12G Linux root (x86-64)
/dev/sda3 109053952 142608383 33554432 16G Linux filesystem
/dev/sda4 276826112 411043839 134217728 64G Linux filesystem
/dev/sda5 411043840 415238143 4194304 2G EFI System
/dev/sda16 142609000 166609000 24000001 11.5G Linux root (x86-64)
Partition table entries are not in disk order.
As you can see, the end of sda3 is the beginning of sda16 (end / start sectors). This happended because I "named" my fourth partition "16" and not "4". Now I have that warning or hint. (I also left some holes...)
So "sda16", would that be #4 (physical) or #6 (numeric sort, like output of fdisk) or #16 (number I gave to that partition) in your fdisk? busybox or util-linux?
but then it is no error (never was), just a confusing comfirmation by fdisk? With my fdisk I have never seen this, but it has
-w option which handles exactly that: depending on interactive or not, AUTO, NEVER or ALWAYS wipe (says manpage).
I just checked my partitions with
wipefs: sda1 to sda4 have one line, sda5 has 3 lines, sda16 has no line. I don't understand why. If you end up with a partition #3 after answering that question Y or N, it should be OK.
The question could mean: On this newly created #3, keep or wipe the signature?
fdisk -V gives me: "fdisk from util-linux 2.34"