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I want to create swap on /dev/sda3, but parted -l doesn't show me.

Number   Start   End      Size     File system   Name   Flags
1        1024kB  17.0GB   17.0GB   ext4
2        17.0GB  17.5GB   500MB    ext2                 boot, esp
3        17.5GB  20.0GB   2500MB

I executed this commands:

swapoff -a
mkswap /dev/sda3
swapon /dev/sda3

And what does warning: wiping old swap signature mean?

  • Done, I am sorry. – J. Doe Jun 13 '18 at 19:41
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The warning means those partition already had a swap signature, e.g. the mkswap command was already executed in the past in that partition.

As you executed mkswap again, it warned you it would be deleting an old signature.

As for fdisk does not showing it, it does mean the partition is not labeled as a partition device, however it does not mean it is not being used as such.

To put there the code for swap partition, you can do:

sudo fdisk /dev/sda
Commmand: t
Partition number: 3
Hex code: 82

Where:

  • t is the command to label a partition with a code´
  • 3 is the partition number
  • 82 is the hex code por a swap partition.

After that,fdisk -l will show sda3 as a swap partition.

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