Take Local backup for all the current files (which is currently in Ubuntu 20.04.4), then reinstall OS with Control Panel (Ubuntu 18.04), Then rehost all the files including the flask, apache2 web server etc. but keep in mind, the Ubuntu version should stay 18.04 with webmin control panel.
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Hello, I'm an expert. I have more than 7+ years of experience as a Linux System Admin. I have excellent knowledge and exp of Apache. I can help you right away. Ping me asap, and let's discuss this! Thanks!