Much more information is necessary. If possible, boot into a Live ISO environment. From there, open the browser here and provide us with the output for:
│ File: /etc/fstab
───────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────
1 │ # /etc/fstab: static file system information.
2 │ #
3 │ # Use 'blkid' to print the universally unique identifier for a device; this may
4 │ # be used with UUID= as a more robust way to name devices that works even if
5 │ # disks are added and removed. See fstab(5).
6 │ #
7 │ # <file system> <mount point> <type> <options> <dump> <pass>
8 │ UUID=****-**** /boot/efi vfat umask=0077 0 2
9 │ /dev/mapper/luks-*********************************2b / ext4 rw,defaults,noatime 0 1
10 │ tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
11 │ /dev/mapper/luks-*********************************4b /home ext4 rw,relatime 0 2
If by system you mean the root partition, aka / then is not available to write there as your user, never was the case. You can write on your home and on partitions dedicated for data that you took ownership ower.
Have you start reading that article i linked?
If you really want to creat that folder, then you run sudo mkdir /test
to remove it sudo rm -rf /test
but what are you doing with it? Each time you want to do something , as your user, you will have to get administrative privileges … So why is better to have a folder there than on your home direcotry?
yes i need full rules, what nonsense? What am I on Windows? I already know that in this article, but can you just say what to do. the problem is in fstab?
@randomidiot Not having access to the root filesystem is by design and should not be changed, if you want to modify or delete something you should use the sudo command or open a folder as administrative user in Nautilus, any changes to your root files without knowledge will break your Operating system, if you need to change your files you can always put them under( /home/ramdomidiot/ ) all files under your home folder are writable for your user, anything else mentioned above by other users is still valid, I am reopening this post in case you have any more questions, if you want to solve a different issue open a different post, do not open repeated posts.
1 │ # /etc/fstab: static file system information.
2 │ #
3 │ # Use 'blkid' to print the universally unique identifier for a device; this may
4 │ # be used with UUID= as a more robust way to name devices that works even if
5 │ # disks are added and removed. See fstab(5).
6 │ #
7 │ # <file system> <mount point> <type> <options> <dump> <pass>
8 │ UUID=****-**** /boot/efi vfat umask=0077 0 2
9 │ /dev/mapper/luks-******************************************2b / ext4 rw,defaults,noatime 0 1
10 │ tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
11 │ /dev/mapper/luks-******************************************4b /home ext4 rw,relatime 0 2
12 │ /swapfile none swap sw 0 0