Quote:
Originally Posted by xversion1
Edit: I figured it out. It's because I left SSH on all the time. I thought I just need to turn off Wi-fi to disable SSH, but obviously it's not the case. SSH still affects somehow even if there's no internet.
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It has nothing to do with internet. It is how the filesystems work: you can't unmount one if there's a file opened inside. No matter if the file is a picture you're viewing, a document you're editing or a binary you're running.
The only workaround for OSes to "force unmount" a filesystem with opened files inside is to get a list of file descriptors for the given mountpoint and kill the processes that hold those descriptors.