test1

wget –no-check-certificat https://wordpress.org/latest.zip .
unzip latest.zip
mkdir temp2
mv wp-* temp2/
mv wordpress/wp-* .
mv wp-content wp-content_old
mv temp2/wp-config.php .
mv temp2/wp-content .
chown -Rf betty:betty wp-*
rm -rf latest.zip
rm -Rf wordpress

If wordpress was upgraded to 5.5 and causing any issues, we can try reverting it to 5.4.2.
steps:
1. Take the backup of wordpress fils.
2. Take the backup of db
3. su $USERNAME
4. navigate to the folder where the wordpress is there.
5. use the command: wp core download –version=5.4.2 –force

NOTE: if multiste dont try