both of the above commands woked without any error, shall i reboot ?
If you want, but I think restarting Network Manager should be enough.
Not even sure that’s needed. It’s been a while since I played with network stuff.
Yes,
Thank you so much sir, it works now, no more error, cant thanks you enough, i have exams after 2 days and i was really panicked, lol 
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also, may i ask why did it take so long ?
like, i had changed the server like 13 hours ago and changed it back to normal but it suddenly started affecting now only ?
Presumably something caused the settings to be reloaded.
Or perhaps the symlink wasn’t broken, and the target contained a valid config, but then the target was deleted for some reason (it was on a temporary filesystem). Thereby breaking the symlink.
Good luck with your exams. 
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If one enables systemd-resolved and replace the /etc/resolv.conf with symlink to the stub file - then disables systemd-resolved - then you have no resolver and connectivity is limited.
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