Fix: Unplug any USB drives. The upd installer tries to scan removable media. Also, temporarily disable your antivirus real-time scanner (only during installation, then re-enable).
For Linux distros released in 2019-2021 (e.g., Ubuntu 20.04, Linux Mint 20), this beta version provides the most predictable persistent partition creation. rufus 316 beta 2 download upd
A: This is a false positive common with older betas. The heuristic engine sees an unsigned or old-signed executable that modifies boot sectors. Upload the file to VirusTotal.com. If it shows 1-3 detections (out of 60+), it is likely safe if the signature matches Akeo Consulting. If it shows >10 detections, delete it immediately. Fix: Unplug any USB drives