The requested URL was not found on this server. Error after installing wordpress - wordpress

i have installed WordPress on my Ubuntu machine. i have also installed all the required resources like PHP, MariaDB and others.
At first i navigated to the sample site and i even made some few changes. Then after tempering with settings, when i try to go back to my sample site am getting an error.
This is the image error.
I have tried to do everything i could but still getting the same error.
How can i resolve this

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Yesterday, I was securing my website by adding SSL using the technique given by you. The link is given below
https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-16-04
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The screenshot is attached below

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You need to take a backup of your file ,then fallow the fallowing instruction.
Rename your plugin one by one and refresh the website.
this issue due to the unsupported plugin ,that is installed in your wordpress website.
1- Make a backup copy of the files and from the old database
2- After that, download these files on your PC
3- Install WordPress again
4- Replace the wp-content file with the old one
5- Clean the new database and import the old database through phpMyAdmin
I solved that problem installing an older version of Xampp, with previous version of php, MySQL and Apache. I give up version 8.1.1
XAMPP 7.4.27 / PHP 7.4.27
https://www.apachefriends.org/download.html
There was something wrong on the hosting side. The source of the issue was indeed that WordPress could not write to the config file. Even the hoster was unable to delete the files. We ended up deleting the entire root directory and starting from scratch. Now it's all good.
The lesson learned is that one of the sources of the "There has been a critical error on this website." error is that WordPress is unable to write/edit files. It's also why it could not write an error log. WordPress could have been more descriptive here.

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Edit: I just tried to access my website on my phone and it is showing the website but on desktop, it takes to an error page: http://mysitename.com/cgi-sys/defaultwebpage.cgi rather than http://mysitename.com
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ipconfig /flushdns

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