Recently I've been messing around with swap configuration and I've noticed that my swap partition has been removed and my primary system partition has become extended. I've checked GParted documentation but could not find any direct explanation of what this type of file system actually does. From the name I conclude that it is some kind of container for other partitions.
I have a couple of questions:
What is an extended file system and what is it used for?
Does it matter that my system is on a partition that is under an extended file system?
How do I collapse or merge the extended file system into a regular ext4 file system? In particular I am looking to merge
/dev/sda5partitions so that
sda5becomes a regular