Ubuntu – Linux-swap partition is in extended drive

filesystempartitioningswap

My apology if my question sounded silly, but I am very new to ubuntu. I have just formatted my pc to ubuntu. However, I found out that now I have 3 partitions in my harddisk. One is the ext4 /dev/sda1 which is the system file partition. However, I noticed that I have another partition called extended /dev/sda2 3.08G, and the linux-swap /dev/sda5 is under the extended partition as shown in gparted. May I know is the ubuntu installed correctly? I can only access to my main system partition, and have lost 6G. My harddisk is 80G and ram 1.5G. Thanks.

Best Answer

Seems to be okay. The swap partition is used as virtual memory to extend your RAM. If you want u can remove it, but if you frequently max out your RAM you might wanna leave it. If you do remove it, its not a bad idea to delete its "mount line" in /etc/fstab (needs root privileges).

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You are using LVM. GParted cannot see beyond the LVM volume, it can only see that the LVM volume is present.

115 GiB = 115*1024*1024*1024 bytes ~ 123480000000 = 123.48*1000*1000*100 = 123.48 GB (close enough to your SSD size) - that's an artifact of using SI decimal prefixes in some places and binary prefixes in others.

Presumably the 4GB swap partition you made was not formatted correctly. You can unmount it and run:

sudo mkswap /dev/ubuntu-vg/swap_1
sudo swapon -a

What Ubuntu did here is presumably this:

Created a 250 MB /boot primary partition.
Created an extended partition for the rest of the partitions.
Created an LVM volume within the above extended partition.
Created your root and swap partitions within the LVM volume.

(That's why you have both sda2 and sda5. Try using the lsblk command to see how they're related.)

Why the swap partition did not get formatted correctly is a mystery.

To delete the swap and merge back the space to root:

Disable swap. The live environment automatically activates any swap partitions it finds:
```
sudo swapoff -a
```
Use lvremove to remove the LVM logical volume of the swap:
```
lvremove ubuntu-vg/swap_1
```
Extend the root partition's logical volume using lvextend:
```
lvextend ubuntu-vg/root /dev/sda5
```
This will use all the available space on /dev/sda5 (the 4GB left).
Use resize2fs to resize the filesystem on the root partition to use the new extra space:
```
resize2fs /dev/ubuntu-vg/root
```

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