This can be quickly fixed in 2 steps:

1. Adding the ubuntu user to the www-data group
2. Giving write permission to everyone in this group

Adding the user:

Run this command to add the ubuntu user to the www-data group

sudo addgroup ubuntu www-data

You have to logout and login back again for changes to take effect.

Give the write permission:

Assuming your web directory is /var/www we run following command to give everyone in the www-data group write permission to this directory

sudo chmod g+w /var/www -R

Try editing or creating new file in /var/www directory to verify

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