I made newbie mistake. While installing game with lutris, showed read access error then i take ownership with gnome-disk app. Now system disk not able to perform properly. Can i fix this issue, i dont want to install from usb drive again
What is the issue?
The orange message says it MAY not work correctly IF removed.
It doesn’t say it won’t work properly.
This graphical tool potentially alters your /etc/fstab
So:
look what is in there and if you are not sure how to interpret it, show the content here.
cat /etc/fstab
format the output as preformatted text → this button: </>
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=81EA-271B /boot/efi vfat defaults,umask=0077 0 2
UUID=2aa359da-9a18-4b13-b417-8ef9ffb9bddf / ext4 defaults 0 1
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
LABEL=kioxia\040ssd\040480gb /mnt/kioxia\040ssd\040480gb auto nosuid,nodev,nofail,x-gvfs-show 0 0
LABEL=wdc\040hdd\0401tb /mnt/wdc\040hdd\0401tb auto nosuid,nodev,nofail,x-gvfs-show 0 0
i cant install any app, package from pamac(add/remove software)
(here was a screenshot of pamac-manager …)
/etc/fstab looks fine
Only you can know what the last two lines are for, but your / (root partition) is fine.
To verify, look at the output of:
lsblk -f
That’s a different issue.
You are trying to install some AUR packages and the authentication for the action failed.
Refresh the list of mirrors and try again.
Nothing more can be gleaned from that picture, so I’ll remove it.
If you must post pictures, post them to some image sharing site and put the link to it here.
it’s showing same(authentication failed) while refreshing list. well, i just install again.
That is Ok. I have used the very same method countless times - learning by doing - eventually, the lesson is learned and the knowledge remain 
I recall this has been discussed before and there is a method to restore permissions to package install state.
The package pacutils contains a utility pacrepairfile
So you could use a rescue ISO to repair the file system permissions
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Does it even let you do that? I can’t see any way to do so in your screenshot.
Do you actually have an issue?
Have you taken ownership of the / partition?
ls -l /
Have you tried pacman? It might at least give us some information.
It does, though I have no idea how and I am not brave enough to try as I prefer the regular command line way.
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I gave up my inclination to respond when he said:
which is likely what he has opted to do in the meantime …
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That seems to say it all.