Clearly on the installer says that it will keep my files and only the setting will be cleared if I proceed the installation, and now the files are gone.
But, I find my old user folder inside
/media/ but I can't navigate to or look in it.
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You cannot skip releases while upgrading, this also applies too upgrading via the Ubuntu ISO.
This means that, unless you had a separate
/home partition, Ubuntu 16.10 was installed over 13.10 withouth preserving any previous files.
If you want to recover any important files stop using your computer, turn it off your computer right now and use an Ubuntu or any other Linux live ISO and try to recover your files with TestDisk