if the install had finished and the installer was simply reading the flash drive to clean itself up, unmount filesystems and reboot, then chances are you are fine. However, as a personal rule I never allow an installation to go into production if there were any unexpected anomalies during installation. its just not worth the risk.
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Yep, that can happen. At that point everything installation related should already be unmounted, so just power it off hard and be done.
Or just press AltGr-Print-S to emergency sync the disks and AltGr-Print-B to the reboot hard, magic sysrq keys.
I had this or a similar issue right after installation many times. I force rebooted and everything was fine. I wouldn't worry about it too much
No, you’re fine. You just yanked the install media before it was done putting itself away. Depending on how it was made, the install media might not even be damaged.