Fedora 30, installer: /dev/sda5 is already looked at and cannot be used to install. How to unmount?

Question

linux

Good afternoon, once again I'm trying to install Fedora as a second OS with Windows on a UEFI system and I get such an error (everything is in the photo), and I don't know how else to solve it. I install Fedora on a separate ssd, a clean disk that is not broken. The installer swears that the /dev/sda5 disk is already mounted, try disabling it and reinstalling it, BUT I don’t understand where it comes from if /dev/sda5 is like a disk under Windows that was created for personal files and the efi partition is sda2 which I mount in / boot / rfi
Everything as I broke it can be seen in the photo.

Mistake

Answer 1

Can you open the terminal? If yes, try lsblk first, it will show all block devices, partitions on them and mount points if any. Well, if, suddenly, / dev / sda5 is mounted somewhere, then umount / dev / sda5.