The installer failed to create partion on disk

The error is real - it is caused by Plasma settings → Removable Storage → Removable Devices → Uncheck On Login and On Attach

I banged my head at it 5-6 times before I realized what was going on - a test system to locate another inconsistency in Plasma (Does Fall Apart effect work in your Kde Plasma?).

I saw another topic with the same issue

The error may also indicate the partition is mounted and the installer cannot format the partition.

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