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I am with Ubuntu 18.04 OS alone with GPT Partitioning Style.

I have several times installed dual OS, removed one OS etc.
I never let my data to erase. in regards to this i am only deleting the partitions like EFI, MSReserved, OEM, "ext4 /", "ext4 /home", swap etc etc

I want to know why /dev/sda shows irregular numbers like below and how can i make them in order.. i want to see the below table in this order..sda1 sda2 sda3 sda4 and sda5

Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 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
Disklabel type: gpt
Disk identifier: 918BD4B2-E90D-4F50-8E3E-4EFE6B86495D

Device Start End Sectors Size Type
/dev/sda1 2048 194559 192512 94M EFI System
/dev/sda2 194560 65298431 65103872 31G Linux filesystem
/dev/sda3 65298432 488957951 423659520 202G Linux filesystem
/dev/sda6 488957952 1221242879 732284928 349.2G Microsoft basic data
/dev/sda7 1221242880 1953523711 732280832 349.2G Microsoft basic data

enter image description here

Update: Issue solved with @crass answer. enter image description here

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Use sgdisk from the gdisk package to sort the entries. This can be done by issuing sgdisk -s /dev/sda.

   -s, --sort
          Sort partition entries. GPT partition numbers need not match the
          order of partitions on the disk. If you want them to match,  you
          can use this option.  Note that some partitioning utilities sort
          partitions whenever they make  changes.  Such  changes  will  be
          reflected  in  your  device  filenames,  so you may need to edit
          /etc/fstab if you use this option.
  • Nice feature of gdisk. I would have said just use parted to delete the partitions and recreate them with exactly the same start and size. – psusi Jun 22 '18 at 22:43
  • @psusi thanks for your comment. in that case i will loose the data rite? – PRATAP Jun 22 '18 at 22:50
  • @PRATAP, if you follow psusi's method correctly (recreating the partitinos at exact same sector values), you won't lose any data... but it can be a scarier thing to do – crass Jun 23 '18 at 0:19

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